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First entry in 2012 - the story continues. Thanks for the simulation program and the GREAT fun working on decrypting the 10 tasks. Cool nerd stuff :-)))
This is a hands-on experience that can be understood. All I would still like to know is how the wires inside the weels are soldered.
Max
Germany Max Murdoch < murdoch@gmx.net> - Tue Jan 17 16:02:18 CET 2012
I really appreciated the detailed explanations of the hand-ciphers. There are so many programs to utilize them these days that the average person doesn't realize they were designed to be coded/decoded manually.
That said; I notice that all the downloads are Windows machines. I would like to suggest that equivalent Mac versions of programs be captured in the downloads section, if/when they are available. Alternatively; programs in a multi-platform language/script (JAVA, PERL, PYTHON, or JAVASCRIPT) would be even better and very much appreciated.
Regards;
Gary
Canada Gary < not@guestbook> - Sat Dec 24 17:03:01 CET 2011
I'm waiting for a 'Custom Standard One-Time Pads' option in the next 'Numbers secure RNG'.
This option would allow much larger groups (say, 1000 - 1800) than the standard 250 number group.
Great site, keep up the excellent work.
Saudi Arabia Richard Blaine < not@guestbook> - Mon Dec 12 08:57:54 CET 2011
Thanks Dirk, i love cyphers and Enigma was the greatest non-computerized one ever, thank you for helping me do more wit hmy passion
United States Jonathan < Flashburn283@gmail.com> - Wed Dec 6 00:14:33 CET 2011
Dirk,
enjoying your excellent site and trying the simulators for the M-209 and the KL-7.
Used both while I was in the Army and this brings back fond memories.
Thank you for your time and effort in preserving these machines for another generation.
best wishes, Maurice Cammack
United States Maurice Cammack < mecammack@telepak.net> - Tue Dec 6 18:45:12 CET 2011
hi dirk,
thanks for the update re the enigma v7 simulator,excellent !!
thanks also for your input re the use of cryptool and assessing the randomness of binary files all the best.
dave
United Kingdom dave smith < davesuejon@yahoo.co.uk> - Tue Dec 6 14:16:31 CET 2011
Hallo Dirk!
Vielen Dank, das du dich seit Jahren um diese tolle Seite kümmers, und uns mit wertvollen Programmen und Informationen versorgst.
Einfach Klasse :)
Austria Andreas Scholler < not@guestbook> - Fri Dec 2 21:56:42 CET 2011
Impressive work. Excellent graphics and very realistic. Congratulations Dirk
Spain Jesus Romero < not@guestbook> - Sun Nov 20 09:37:58 CET 2011
Great site Dirk - I've really only scratched the surface of it so far but lots of interesting things, nicely presented and explained, to take a further look at! I especially like the new improved Enigma rotor tech description pages ! ;-) The Enigma info here was significant in helping me to build my own little flexible Enigma simulator (unix command line application) which has no nice graphics but seems to be working fine. I made it as a programming exercise and a first step towards thinking about a 'virtual bombes' type solution to crack the Enigma code inspired by a recent visit to Bletchley Park (if 'spare' time permits...) so I will be reading more on this site!
Regards/ Henry
United Kingdom Henry Lockyer < not@guestbook> - Wed Nov 16 17:31:33 CET 2011
Very instructive website precise and well realized.
France Alexandre TERRAT < alexandre.terrat@hush.com> - Sat Nov 5 00:52:25 CET 2011
great sim! great page!
As a Sys-admin/electronics engineer/radio HAM with a passion for all things "tech" it doesn't get any better then this!
Have you ordered your electronic replica of the Enigma yet from the people at bletchley park yet?
The proceeds help the upkeep of the restored Colossus!
Belgium paddy lynch < not@guestbook> - Fri Nov 4 18:22:12 CET 2011
Hallo Dirk,
De simulator is geinstalleerd en werkt uitstekend. Prima werk van je. Ik heb altijd belangstelling gehad voor " Bletchley " en alles wat er mee te maken heeft. ( XX, England Spiel, Ultra ). Nu de codes kraken, dat wordt spannend.
Belgium Paul Martens < biggles_50@hotmail.com> - Thu Nov 3 18:54:09 CET 2011
a great website dirk ! an excellent educational resource and more!! a great find on the internet. you have done a service to us all who may come now and after us.
United Kingdom dave smith < not@guestbook> - Sun Oct 16 23:42:48 CET 2011
Very nice page and not only program but technical reference of machine is great. Germans were not stupid. They constantly developed their machine. To the 15 December 1938 there were only 3 walzen to choose from 3. It makes 6 possible combinations(3*2*1). After that date 3 walzen but too choose from 5. It makes 60 combinations (5*4*3)I have stopped at message 7 but for a while. I have first unknown stecker in 8 but a took rest and dont have much time like in summer . Sometimes cryptologist can get headache. If i want know in detail how it works i have built paper enigma with every reflecors and rotors. Nice and useful tool.
Poland Krzysztof Mroczka < not@guestbook> - Fri Oct 14 23:09:32 CET 2011
Although I was mildly interested in Enigma before, the availability of the Enigma-e brought it closer to home. After building it, I installed several simulators on my PC, then my laptop and now even on the iPad. Enigma on the go - can you imagine the look on a WWII Enigma operator'sface if he'd be shown such a thing? After visiting a lecture by the Enigma-e designer I started reading up on the subject (do definately read Winterbotham and Welchman!) and bought a stack of books (mostly 2nd hand through Amazon) on the subject nearly one meter high. Haven't quite finished, but working on it...

And then I found the Enigma Challenge. At first I didn't think I would be able to finish it. But Dirks reassuring "You don't need to be a professional cryptologist or maths geek!" convinced me to jump in and I haven't regretted it for a single moment. Not only do the messages bring you an interesting journey of WWII itself, playing with the settings to get to the decrypts proved a very effective way of building up a better understanding of the inner workings of the Enigma. Kudos to Dirk for setting up the challenge! All in all it took me six months from breaking #1 to finding the complete settings for #10. Not a full time occupation of course - you have the luxury of knowing that no lives depend on your decision to watch telly tonight instead of puzzling over a stecker. Enjoy the holiday sun instead of wondering how to tackle a wheel order problem. But those moments of solitary thought, trying to crack another of Dirk's stages in the challenge are sure to teach you more about the way Enigma works (and some of the ways to crack it) than just reading about it in a book. And in the process, it brought to me even more respect for the people at Bletchley Park and in America who did this under the pressure of war, without the technical means available to us today.

Thank you very much Dirk.
Netherlands deBart < not@guestbook> - Fri Sep 30 09:39:50 CET 2011
Fantastic website Dirk. Very informative and fascinating. Regards, Rob
South Africa Rob Stayt < staytrj@ananzi.co.za> - Mon Sep 5 16:01:10 CET 2011
I like this program very much, it's a kinda boys dream come true. And så realistic as you have bin there your self.
I'm writing a piece for school about WW2 and this make it perfect.
Thank you
Denmark Adam Secher < adamsecher@gmail.com> - Sat Jun 11 01:08:20 CET 2011
Fascinating! After I read Simon Singh's The Code Book I just had to find a simulator or a buildable kit to go further with the Enigma. Your simulator saved me a bunch of British Pounds! I am a retired school administrator and retired member of the US Coast Guard Auxiliary here in Darkest Arkansas, by the Arkansas River at Fort Smith. Mostly I now do American Civil War reenactments. You can check out that at [http://home.earthlink.net/~starbird1942]
Again, Thanks!
United States James C. Starbird < starbird1942@earthlink.net> - Sun May 15 02:38:51 CET 2011
Amazing site. Lots of history information. Great job Dirk. Thanks. Keep the good work.
Brazil Kestrel < not@guestbook> - Thu May 5 03:52:07 CET 2011
Thanks so much for the time you took in creating/updating this site - the information is very valuable and interesting...keep up the good work!
United States jh < not@guestbook> - Tue May 3 12:22:51 CET 2011
This is awesome, if one can think that breaking this has changed the outcome of the world war. Thanks for producing this software.
Belgium Neoweed < neoweed@gmail.com> - Mon Apr 25 13:32:02 CET 2011
Mr. Rijmenants - I thoroughly enjoy your website and your simulators! Thank you so much! You should consider taking financial contributions for your work! - VR, Tom
United States Tom < not@guestbook> - Sat Mar 19 06:56:12 CET 2011
Wow! This site has so much information, it blows the mind!. I've already leadrned so much! History has always interested me, but this is a tangible way foe me to execute it. What a great reasource! (and FREE to!)!
United States Lt. Col. Crawley < ltcolcrawley@yahoo.com> - Sun Mar 6 08:04:32 CET 2011
Zeer interessant,mooi in elkaar gezet.petje af!
Netherlands A.R.Bootsman < not@guestbook> - Sat Mar 5 20:57:48 CET 2011
Hi Dirk. Nice and interesant.. Great job. Good luck. Jan.
Slovakia Jan < jrepak@pmxmail.sk> - Thu Mar 3 11:01:34 CET 2011
Dirks Rijmenants has created a great web page. His simulator is the best, by far, of all available ENIGMA simulators. The historical information and supporting information for the ENIGMA machine are outstanding.
United States JIM RYBAK < not@guestbook> - Thu Feb 17 16:56:22 CET 2011
What a fantastic site! I've been interested in numbers stations since I first heard one as a kid in the 70s on a shortwave radio I had brought back to life (learned how to test and replace these things called 'tubes'). I've never found more than a few bits of information about how one-time pads worked, but never how they constructed the messages for broadcast. I am a kid in a candy store here! Thank you so much for sharing in such a well structured and entertaining way. We greatly appreciate your work and passion!
Toodles old bean.
United States Curt < curt.s.meadows@gmail.com> - Thu Feb 10 03:54:08 CET 2011
Great bit of techie nostalgia. The software is great stuff. Pip, pip
Toodles old bean.
United Kingdom AL Brims < not@guestbook> - Mon Jan 10 21:55:56 CET 2011
Great website, with a lot of historic references. This makes cryptography even more interesting! The software I like the most is ATOMIX, but can't find information or historic references about it on the Internet. Is it only a virtual machine?
Belgium Rocky < not@guestbook> - Thu Nov 18 20:04:48 CET 2010
Thank you for the wonderful and extensive web site you created and the simulators are nothing short of amazing. I've downloaded and spent time with all of them.
This is the best collection of information I've seen in one place since an uncle sent me a copy of the Code Breakers in the mid 60's. I've been hooked ever since and deeply regretted not getting to work on codes and cyphers full time throughout my life.
Thank you again. I come back to your website again and again over the years.
Henry Roberts
United States Henry Roberts < not@guestbook> - Wed Nov 17 02:02:39 CET 2010
Great website!
United States Ronald Adamse < ronaldadamse@gmail.com> - Fri Oct 8 00:34:16 CET 2010
Excellent site, my compliments.
The cryptographers were among the very brightest people of all time. The story of their hard work and success is so very impressive. My thanks to them for the Allies’ lives that they saved.
United States Faultersack < not@guestbook> - Sat Sep 18 22:44:53 CET 2010
OMG, I LOVE YOU!!! >_> Ok, not really. But, I do love how easy you made enigma to understand. Thank you!
United States Aaron < not@guestbook> - Tue Aug 24 18:09:47 CET 2010
The first Enigma machine was built in 1404, albeit with just 2 rotors & finger powered, but exactly the same principle.
Excellent site.
Republic of Armenia
Armenia Ardavast Vahani Avedissian < armen.arto@gmail.com> - Fri Aug 20 09:53:12 CET 2010
Excellent site. I recently visited Bletchley Park and saw enigma machines, collossus and the bombe and was totally bowled over as to how complicated it was.
I tried writing my own Enigma in VB to get a grasp of it and after a day spent getting the wheels to step properly i got totally lost in how to actually encode a letter! I could probably build a real machine faster as i'm an engineer but i'm afraid to say i gave up and downloaded your fantastic example, well done.
United Kingdom Dave Kearley < mail@davekearley.co.uk> - Tue Jul 13 10:57:39 CET 2010
Thanks for the cipher machines simulators. I really like the realism of the C-52 and Enigma simulators. I learned a lot from your site about crytology. Again thank you very much
United States Audie Geronimo < audiegeronimo@yahoo.com> - Tue Jul 6 06:37:08 CET 2010
Dear Mr. Rijmenants: Thank you very much for your excellent and unique cryptic work. I’m an amateur hamradio operator, and always looking for secrets codes and messages in the radio spectrum. It is a privilege to visit your illustrative webpage. Best regards, Angel-KP4EU.
Puerto Rico Angel L. Saavedra < kp4eu@yahoo.com> - Mon May 24 04:57:52 CET 2010
Klasse und gut gemachte Webseite. Freundliche Beantwortung der Anfragen. Weiter so.
Klasse en goed ontworpen webpagina. Vriendelijk antwoord op de vragen. Keep it up. Over een bezoek zouden we blij. [www.u-boot-zentrale.de]
Germany Karsten webmasterXYZ@u-boot-zentrale.de ( remove XYZ ) < not@guestbook> - Sun May 23 07:35:01 CET 2010
perfect stukje werk op deze site, veel geleerd in korte tijd, neem rustig de tijd om alles door te nemen en te proberen. toch wel knap dat ze dit toen al konden maken...
Spain eduard < evanbiezen@gmail.com> - Sat May 15 03:35:48 CET 2010
Knappe site waar nog vele een voorbeeld aan kunnen nemen. Alles wordt duidelijk uitlegt.
Ik heb hier al heel wat bijgeleerd.
Belgium GEERTS FRANK < not@guestbook> - Thu May 13 21:04:09 CET 2010
This is truly amazing. I have learned more in the last 3 hours than I ever thought I could. Thank you and I am looking forward to a challenge!
United States PAllen < coxphilly@hotmail.com> - Mon May 10 23:04:34 CET 2010
With a lot of help from Dirk I finaly "solved" the Enigma coin puzzle. My next problem is to try to export beer from Sweden to Belgium. Not easy since Belgian beer tastes much better then Swedish. But I will have a go at it :-) Thanks for an outstanding simulation program.
Denmark geoskane < not@guestbook> - Sun Apr 18 22:00:14 CET 2010
Thanks a lot for that great piece of software which allowed me to decrypt a message I received with a Geocoin - but only after Dirk helped me a little with the setup of the program. Cheers! :beer:
Germany Friedemann Schorer < not@guestbook> - Mon Apr 12 20:17:53 CET 2010
The best edutainment on earth in my humble opinion. The Enigma and the instructions leads you into a fascinating world of history, decryption and solving puzzles even in the geocaching society. Thanks Dirk for an excelent job, I wish I had more time and IQ to really grasp "it all". With your help I at least I know the basics of the Enigma.
Sweden Mats-Ola Ekberg < mazola@rocketmail.com> - Wed Apr 7 20:37:29 CET 2010
As a freelance signals security consultant, I owe you guys my job. If I wouldn't have used this site during college as a recource, I wouldn't have graduated. Thanks, dirk. I owe you one, man.
United States Stephen K. Rathje < st.rathje@gmail.com> - Sun Feb 28 20:29:32 CET 2010
HI, THIS PAGE IS FANTASTIC, GREAT JOB. MY NAME IS IVAN DIB BUCHALA, FROM BRAZIL, SÃO ROQUE, STATE: SÃO PAULO.
Brazil IVAN DIB BUCHALA < ivandib@ig.com.br> - Thu Feb 25 14:42:47 CET 2010
Nooit gedacht nog eens iets van de Kl-7 terug te zien. De simulator is geweldig en ik kan uit ervaring verklaren dat deze de werking van de echte Kl-7 volledig simuleert. Oude tijden herleven weer!!
Netherlands Richard van Binsbergen < not@guestbook> - Sat Feb 20 20:02:58 CET 2010
Das ist ja erste Sahne!
United States Tom Flaherty < not@guestbook> - Sat Feb 13 11:01:38 CET 2010
Thanks for creating this remarkable, fascinating, and educational program.
United States Steve Cator < not@guestbook> - Fri Feb 12 00:27:56 CET 2010
I am quite pleased, not to mention relieved, to have completed the Enigma Challenge. I learned a lot about Enigma in the process, and improved my programming and statistics skills also! You have a great collection of links, and the Enigma simulator is a magnificent piece of work. Met vriendelijke groet. Jerry.
United Kingdom Jerry McCarthy < jerry_mccarthy@talk21.com> - Fri Jan 8 11:11:37 CET 2010
Thank you for making available all of these hard to find programs and the great information that goes with them.
Germany Frank Merlott < not@guestbook> - Mon Jan 4 03:33:08 CET 2010
Excellent website and some fine software applications. Yours is the best OTP utility out there.
Ukraine George Smiley < not@guestbook> - Tue Dec 8 12:27:55 CET 2009
I came across your website via a link in Wikipedia. Good job!
Malaysia Ashaadi Fandzuri Adnan < not@guestbook> - Wed Nov 25 10:03:41 CET 2009
That's an excellent Site, thank you very much! Question: I am searching for a simulator of the M2114 Model. Where can I find it? Or is the M3 or M4 the same? I need to decrypt a message of a quiz. But they mention an 'inner' an an 'outer' ring. But your simulation only has one ring. Who can help? Thanks!
Switzerland Martin < boarderfan@gmx.ch> - Sat Sep 26 10:11:07 CET 2009
Congratulation, keep this excelent work!
Such amount of information about many classical cipher is really hard to find in one site alone.
Tanks!
Brazil Daniel < anonymous@thanks.br> - Sun Sep 20 02:06:57 CET 2009
Excellent work,Excellent information, Excellent simulator! Feels very real. Thanks.
Argentina Pablo Merighi < not@guestbook> - Mon Sep 7 00:23:10 CET 2009
Very good work. Well done!
Canada Jeremy Gorsline < not@guestbook> - Tue Sep 1 21:47:33 CET 2009
Thanks for a fantastic webpage and a very stimulating challenge. It have given me alot of amusement, and some gray hairs too;-) and a fantastic historic trip through ww2.
Sweden Martin Eklöf < not@guestbook> - Tue Aug 18 00:40:28 CET 2009
Excellent. Good Simulator. I'll learn this simulation. Excellent 5 stars.
Indonesia Chudry < chudry81@yahoo.com> - Fri Aug 14 00:38:16 CET 2009
Hello!
I just wanted to let you know that this is such a cool place!!! Love it!
Thanks!
Sweden Anders Samuelsson < not@guestbook> - Wed Aug 5 19:15:37 CET 2009
Waaaaaah!
hoe kan het dat ik deze site nu pas zie.
Geweldig alles bij elkaar, wat een werk. Zeer mooi gedaan!
Netherlands plens < not@guestbook> - Tue Jul 28 20:10:02 CET 2009
Het so pas David Kahn se Codebreakers gelees en was op soek na verdere inligting oor OTP. Vind toe jou website. Verstommend en fantasties!
South Africa John Blanckenberg < not@guestbook> - Sat Jul 11 13:00:16 CET 2009
Excellent information. I enjoyed reading it and learned a lot. Thanks!
United States Karl Schantz < not@guestbook> - Wed Jul 8 21:38:50 CET 2009
What a fantastic site. I've been reading pages and playing with software for hours and I've only just scratched the surface. So many valuable links too. I wanted to let you know that your work is very much appreciated. I'll be a regular visitor from now on.
Thank you.
United Kingdom MikiStrange < not@guestbook> - Mon Jun 29 12:51:04 CET 2009
Hey bedankt voor de bruikbare informatie voor mijn PWS
Belgium Niels < not@guestbook> - Mon Jun 30 09:27:18 CET 2009
Keep up the good work!
United States Sam Snead < ssnead2929@gmail.com> - Sat May 30 02:12:44 CET 2009
Absolutely amazing work! Amazing software simulations, extremely informative. The best site!! Thankyou for all your hard work and enthusiasm it is truly appreciated.
Australia Earl < not@guestbook> - Fri Apr 24 23:35:07 CET 2009
Mijn hobby is geocaching. Dat houdt in dat ik dikwijls puzzles op moet lossen die me naar een cache leiden. Een bevriende geocacher uit Denemarken had een "Enigma" puzzel voor me. Mede dankzij jouw site en de gave simulator was ik in staat voor hem de puzzel op te lossen! De volgende twee "mystery" caches gaan over de Fialka en Hagelin machines. Gelukkig heb je ook voor een van hen een simulator. Voor de Fialka heb ik een andere site gevonden. Bedankt voor de "indirecte"steun!
Belgium Ans Wouters < ans.wouters@gmail.com> - Mon Mar 23 13:56:32 CET 2009
Diese Seite ist ein echter Schatz, für jeden Hobbykryptologen.
Der Autor ist sehr hilfbereit, und erklärt z.b bei bedienungsproblemen zu einer Simulation, geduldig und gut verständlich, wo das Problem ist.
Auch die anderen Programme wie der One Time Pad sind gut erklärt, so hat man neben dem Programm auch gleich sehr viele Informationen, ohne erst viel suchen zu müssen.
Auch allgemein befinden sich viele Informationen über Kryptografie im allgemein (unabhänging von den Programmen) auf der Seite.
Die Seite ist wie ich finde sehr gut gepflegt, und übersichtlich gehalten.
Danke an dem Author für diese tolle Seite!
Germany A.Scholler < not@guestbook> - Mon Mar 9 17:04:43 CET 2009
Dirk, hartelijk dank voor deze fantastische en informatieve site.
Netherlands Johan Visser < not@guestbook> - Sun Feb 1 18:08:11 CET 2009
Hallo
Ik doe zelf studie naar deze codes ga op korte termijn mee doen aan het CONET PROJECT met mogelijk doel om dit te decoderen wat nog best een knap stukje werk is.
Tevens vind ik deze site erg goed in elkaar gezet
Met vriendelijke groet
Netherlands Michel < not@guestbook> - Wed Dec 3 16:19:04 CET 2008
Thanks so much for your amazing work! My fisrt novel (hopefully to be published in late 2009) made extensive use of the Enigma Sim. I will sign again when it is released to let you know.
And thanks for your kind reply to my email. Keep up the great work.
United States Callum MacAlister < not@guestbook> - Thu Nov 20 23:16:56 CET 2008
Thanks! Very intresting information about Enigma.
United States mgbada lai < not@yahoo.com> - Thu Sep 9 12:30:44 CET 2008
Excellent site. Found a lot of useful info here, and have had a lot of fun using the hands on approach with the Enigma Simulator.
Thanks so much for providing all of this for us!
United States Effigy < not@guestbook> - Fri Sep 19 10:24:03 CET 2008
Great stuff!
Sweden SvenP < sven@svenp.com> - Thu Sep 4 18:34:51 CET 2008
Hi Dirk,
thanks for compiling lots of information on enigma and cryptography! Encryption is a fascinating topic and there is always a lot to learn. All the best! Christian from Austria
Austria Christian Fiedler < not@guestbook> - Wed Aug 6 20:40:02 CET 2008
Thanks! Very intresting information about Enigma.
Finland Jani < not@guestbook> - Wed Jul 16 14:41:52 CET 2008
Hi Dirk, Thanks for replying to my email.(i could not resist sending it in code). Great sim, enjoying learning about enigma etc, your pages are very helpful. Regards John.
United Kingdom John Walsh < kemmelpease@gmail.com> - Wed Jul 2 17:47:22 CET 2008
I love your website, it's great for my research paper over WWII cryptology. However,if you'd like to be accredited more often it might be good to have information on how to cite this website.
United States Just someone doing a paper < not@guestbook> - Sat May 10 22:43:08 CET 2008
Dirks, via via kwam ik op deze site en mijn belangstelling was gelijk gewekt. Heb de site onmiddellijk bij bij nijn favorieten in het mapje "verbindingsdienst" gezet, zodat ik de site eens rustig kan bekijken. groeten joop volkert
Netherlands joop volkert < jvolkert@hccnet.nl> - Fri May 2 16:49:11 CET 2008
Thank you very much for tha information you give at these pages. The Enigma Challenge is amazing! I hope I'll be able to finish it... These pages are a must for various interested in the different branches of Sciences and humanities... Yes, indeed, they are!
Spain Rafael Padilla < rafapadi@telefonica.net> - Mon Apr 21 12:27:57 CET 2008
Great Job! Thanks for it!
Poland Mateusz Wisniewski < matimal@o2.pl> - Sat Mar 15 17:20:39 CET 2008
Dirk, the enigma simulator works like a dream. After trying to make a simple one myself, I know how tricky it is. The Enigma Challenge is simply great, everything is made with great eye for detail and the plaintext stories are in the same league. Solving all 10 challenges kept my grey matter (and my laptop) busy for weeks! Thanks for this great experience.
Netherlands Frank Inklaar < not@guestbook> - Sat Mar 15 09:33:10 CET 2008
Dank-u vor de website
United States Samuel Zara < dinoszara3@aol.com> - Sat Mar 8 19:25:41 CET 2008
I came to your site for the code, excellent.
Thanks for honoring a great American soldier.
Ed
United States Ed Taylor < not@guestbook> - Tue Mar 4 20:24:17 CET 2008
oostende 25/02/2008
Mijnheer,
U hebt fantastisch werk gemaakt........ Ik heb er over gelezen... Ga proberen er wijs uit te geraken... Boeiend tot en met...
Belgium Robert Lenaerts < not@guestbook> - Tue Feb 26 00:04:47 CET 2008
Hi Dirk - you managed to produce a fascinating site; thanks a lot.
Germany Ulli < not@guestbook> - Wed Jan 23 21:16:04 CET 2008
Thanks! Great job. I haven't had so much fun since Orbiter simulation. \m/
Poland Jakub Warzecha < qbeesh@gmail.com> - Tue Jan 17 11:57:39 CET 2008
Well Well... What can i say? Dirk, you leave me speechless... I havent seen such perfect simulators.. but more than that, i havent met or known anyone who's so so so genuinely helpful and concerned for people!!! Dirk... You're the man!!! :)
United States Saira Junaid < sairajunaid@hotmail.com> - Fri Jan 11 05:35:41 CET 2008
guys like you recovers my belief in internet
bruno, Melbourne
Australia bruno < not@guestbook> - Mon Jan 7 04:50:06 CET 2008
Great work, Mr. Rijmenants!
It is wonderful that some people have such incredible bags and spend a lot of their free time to share results of their hobby-work with others! The ciphering area isn't well known to the wider public but your website surely helps to enlarge this knowledge!
Poland Burbon < not@guestbook> - Sun Dec 30 20:46:33 CET 2007
You did a great job! Thanks
Poland Kamil. P < not@guestbook> - Fri Dec 28 13:38:10 CET 2007
I had a programming challenge at school today, and one of the tasks was a much simplified Enigma simulation. I failed miserably, and starting reading up about rotor machines. This website is a great source of information.
United Kingdom James Stanley < jamesstanley@bluebottle.com> - Fri Dec 14 20:37:42 CET 2007
Hi, came across the site only a couple of days ago and already I'm hooked. Great information (fascination), great quizes, all round great site.
United Kingdom Derek Smyth < not@guestbook> - Sun Dec 9 19:48:16 CET 2007
Fantastic website! The ENIGMA simulator in particular and the Challenge are both outstanding. Thank you very much for creating such a good piece of software.
All the best 73 de Philip G0ISW
United Kingdom Philip G0ISW < not@guestbook> - Thu Nov 29 18:44:07 CET 2007
Damn fine program you have made here. Only had one problem and that was half the lights dident light up, I probaly installed it wrong as it worked fine once i re-installed, So realistic the light bulbs went :P
United Kingdom Tengu < not@guestbook> - Sun Oct 28 00:15:54 CET 2007
Hey, cool site! Very cool software. It's a great way to help preserve history and make it available to those who are curious. Thanks!
United States Aaron < not@guestbook> - Mon Oct 22 05:19:40 CET 2007
Finalmente qualcuno ha fatto chiarezza su una materia "oscura"
Italy Mister_xyz < klein70@libero.it> - Wed Oct 9 22:03:08 CET 2007
I was just wondering the other day, what is the total keyspace of ATOMIX machine? :)
Other than that, an excellent site, even better simulators and absolutely number one when it comes to reference :)
Slovenia Tomaz < tomaas_saavik@yahoo.co.uk> - Sat Oct 5 19:00:54 CET 2007
Thanks for the challenges. I've been hooked since I found your page, and couldn't put them down until I finished them.
Great Enigma sim, and a ton of useful info about crypto machines too.
A pleasure to surf.
Spain Javier Marcelo < not@guestbook> - Sat Sep 29 21:07:10 CET 2007
Nogmaals mijn complimenten. Ook de codebook tool is erg leuk gevonden, en zit goed in elkaar.
Netherlands Canovaro < bdu.kriegsmarine@gmail.com> - Tue Sep 18 16:23:24 CET 2007
A truly fascinating, informative and absorbing site. The best Enigma simulator I have ever seen and used. The challenges are varied, imaginative and challenging! Many, many thanks. Terry Dalton
United Kingdom Terry Dalton < not@guestbook> - Mon Sep 17 15:22:57 CET 2007
Excellent site, Especially the challenges,
Be a tough job to stop until i have cracked all the codes. Plenty of useful information on cryprographic techniques.
United Kingdom Dan Goldsmith < not@guestbook> - Tue Sep 4 16:39:02 CET 2007
Your website and work are great!! It´s hard not to get completeley hooked while browsing your site (my computer is now running Stefan Krah´s M4-project client program).
The Enigma simulator is fanatstic. Thank you!
Germany Fenimore < not@guestbook> - Wed Aug 22 16:06:21 CET 2007
Great! I use it to demonstrate codes in my computer education class.
United States Charles S. Roaten < charles_roaten@bellsouth.net> - Tue Jul 24 01:49:52 CET 2007
Your site is really perfect as your simulatores
Poland Piotrrze < not@guestbook> - Tue Jul 17 11:07:29 CET 2007
Dirk,
Your *the* man... And so is your website!
United States Robert < not@guestbook> - Mon Jul 2 16:38:11 CET 2007
Great Work! Thanks a lot for the programms.
Germany Randolf < not@guestbook> - Sun Jul 1 14:12:38 CET 2007
HI.
Thank you very much for this great simulator!!
Luxembourg Stanko < sstankov@pt..lu> - Sun Jun 10 15:12:02 CET 2007
I just came across your SECOM cipher when looking for usable pencil and paper ciphers.. great piece of work.
Japan Tavy < not@guestbook> - Tue May 1 07:02:14 CET 2007
By far the most professional simulator out there. Keep up the good work! The kids love playing with it and we have used it to teach how the machine works.
United States John Drake < not@guestbook> - Sat Apr 28 02:38:47 CET 2007
(From Cremona - Italy)
This is a very great work!
Amazing simulator and very clear, detailed and complete all the entire site including photos.
Thank you very much!!!
Italy Marco < not@guestbook> - Wed Apr 25 22:22:17 CET 2007
Hey! whats up. I like your site, i use it for my school papers, as well as some other guy that signed
Canada Mike < michael_hunt@myway.com> - Tue Apr 24 18:21:06 CET 2007
I'm presenting a school paper on Enigma and it will probably only have your website as a reference. You have covered the subject completely. Thank You!
United States Joe Duran < papa120022002@yahoo.com> - Sat Apr 14 12:48:22 CET 2007
Could it be possible to add an option, to automatically create keys (from a passphrase) for the ACX crypto pad ?
Japan Robert Bruce < not@guestbook> - Tue Apr 10 16:15:03 CET 2007

Note from Dirk: the Crypto Pad key has to follow some important rules to ensure a high level of security. Creating a key from a passphrase that follows these rules would be difficult (for instance, the bit setting of each array must be truly random and that's hardly the case when derived from a phassphrase).
Thanks so much for this nice site. Very good work
Best regards from Madrid-Spain
http://www.criptored.upm.es
COUNTRY Jorge Ramio < jramio@eui.upm.es> - Sat Mar 10 20:53:18 CET 2007
Love the site and the simulator. My "spy kids" will love this thing. Only problem is that the Help file no longer opens on Windows Vista as it is in an obsolete format. Any chance we can get an updated version, or an HTML with the same data on the web?

Thanks.
Ireland Mark Jeffrey < not@guestbook> - Tue Mar 6 17:33:42 CET 2007

Note from Dirk: A new Enigma version 6.4 is out and includes an improved pdf manual with detailed pictures, schematics and other information.
Very interesting website!
Well done
(Like the Enigma simulator as well)
United Kingdom Andrew Savin < not@guestbook> - Sat Feb 3 20:36:10 CET 2007
First I found your site, because I was just looking for an enigma simulator, and learn how this famous machine was working. But than I read about your challenge, and saw in the table of honor that quite a lot other guys are interested in this stuff too. This challenge was definately the reason to get deeper and deeper in the secrets of the Enigma-machine and code-breaking software. Beacause of Dirks creative riddles (written by hand on paper, interesting stories) it was an exciting advanture to finally solve every 10 Messages. This shows in a perfect way how a very theoretical and "boring" theme like encryption can be made exciting for everybody (easy 1st message, getting more and more difficult).

Congratulations Dirk, sngiteerg morf airtsua, Thomas Mueller :-)
Austria Thomas Mueller < not@guestbook> - Thu Dec 28 20:23:41 CET 2006
Hey People!
This is very nice site!!!
Forever Rules!
Brazil Pananto < solvetka73@gawab.com> - Fri Dec 22 19:29:03 CET 2006
The Engima emulator is outstanding! I'm going to explore more of the site.
(USA)
United States Brandon < not@guestbook> - Fri Dec 22 16:32:53 CET 2006
Hey!
Cool site! Never learned so much about enigma, cyphers and WW2.
Your challenge was great, too (interesting content,...).
And thanks for the Enigma simulator and the codebook tool!
regards
Christian
Austria Christian < christian.fibich@gmx.at> - Fri Dec 15 17:09:30 CET 2006
This is one of the most interesting sites I've visited over the net! Congratulations!
United States Mauro Chamani < mailto:mchamani@ig.com.br> - Wed Dec 6 02:48:58 CET 2006
Thank you for your work. It is quite fun to make a riddle with the settings (only "enigma says <all settings for it>" on a piece of paper) and the code anywhere else. they've to find out.
Germany Sebastian Loscher < krang@krang.de> - Tue Nov 28 23:03:31 CET 2006
Loved the history and intrigue.
Canada Harry Brugmans (geocaching: BearGPS) < not@guestbook> - Sun Nov 5 23:04:43 CET 2006
Awesome, we are learinin about this in schjool
United States Joe Barnes < not@guestbook> - Sat Oct 28 19:39:24 CEST 2006
Awesome job on the Enigma Simulator...Great Web Site...will be passing this site along to my kids school for a looking at by they're teachers.
United States Iceman < not@guestbook> - Wed Oct 25 21:56:18 CEST 2006
Hi Dirk
I am a former Merchant Marine Radio Officer.
Worked for German and British Owners from 1978 to 1996.
Retired before technology kicked me off.....
Much interested in Radio Comms history, found your page very educational and helfpfull.
Thank you very much for your good work and efforts to enlight all of us.
10 out of 10 for the simulator.
Best regards
Waldo from Barcelona/Spain
Spain Waldo < not@guestbook> - Mon Oct 16 18:30:07 CEST 2006
Hi Mr. Dirk. I'm interested in History of the WWII and Languages.
You did a really good job doing this simulator. Keep it up!
Brazil Welton < weltongoncalves2005@hotmail.com> - Wed Oct 11 07:00:31 CEST 2006
I like the simulator. The help file shows how the "operator's key sheet" would appear. In addition to the existing "Enigma Settings" display, would it be possible to add an option to display the Enigma settings in the same format as the "operator's key sheet". This would add some historical realism.
United States Robin Snyder < snyderr@savstate.edu> - Sun Oct 1 15:07:52 CEST 2006
Er moesten er meer zijn zoals jij...schitterend !
Belgium Pierre < pierre.knockaert1@pandora.be> - Tue Sep 26 21:42:18 CEST 2006
Great site about crypto. Your machines are great.
Hope you continue to make more simulators.
United States Jim Smith < xkqxjz@charter.net> - Mon Sep 25 15:10:31 CEST 2006
Great web site. I love the Enigma Challenge, even though I am late to the game. The simulator is the best Enigma sim I have seen.
United States Dave < not@guestbook> - Fri Sep 15 20:26:49 CEST 2006
Mooi gemaakt Dirk.
En interessant.
Belgium Peter ON4AGP < not@guestbook> - Wed Aug 30 11:40:00 CEST 2006
Proficiat met de website. Als ex-onderofficier van het 6e bataljon transmissietroepen in Ludenscheid had ik enkel ervaring met Maplay, Slidex en Hertzbundelverbindingen...
Belgium Geert < geertvnh35@hotmail.com> - Sun Jul 30 15:50:28 CEST 2006
Tolle Internetseite, großartige Challenge, sehr gute Enigma-Simulation.
Nochmal vielen Dank für die Mühe all das Material zusammenzutragen. Mir hat besonders die realistische Gestaltung der Challenge gefallen. Man kann viel über die Enigma erfahren, auch die Links sind sehr interessant!
Germany Heinrich < not@guestbook> - Wed Jul 5 07:07:13 CEST 2006
Zeer duidelijke beschrijving van de Enigma
PROFICIAT !!
Belgium Jozef Kerkhofs < kerkhofs@hotmail.com> - Wed Jun 7 01:26:32 CEST 2006
Absolutly brilliant! What about starting an international user group dedicated to sending and decoding messages using your sim?
United Kingdom Charlie Delta Hotel < not@guestbook> - Tue Jun 6 15:51:16 CEST 2006
Zeer duidelijke beschrijving over de Enigma, ook zeer leuk verteld,
heel mooi!!
Netherlands Ronald Boers < boersronald@home.nl> - Mon Jun 5 12:17:50 CEST 2006
Thanks for sharing Amanda Pinson's story. May she rest in peace and never be forgotten.
United States Chris < not@guestbook> - Thu Jun 3 15:06:24 CEST 2006
Great simulator. very in depth and complicated!
United States scott < rentacowster@gmail.com> - Thu May 18 06:01:45 CEST 2006
Fantastic program. Helped me tremendously in developing/tweaking a calculator project.
United States G Bucher < not@guestbook> - Wed May 3 09:14:19 CEST 2006
The Best Enigma Simulator i ever tried. Great work.
And thanks for the codeBook tool
Germany Hershall < not@guestbook> - Thu Apr 13 22:36:56 CEST 2006
Both simulators, the Enigma and the M-209, are great programs! The graphical interface is very realistic! Doing geocaching, some mystery caches in Quebec use those machines so I got no choice and had to learn how they work! Thanks again Dirk!
Canada Alain < alain.roux@videotron.ca> - Tue Apr 11 14:49:35 CEST 2006
Fascinating site. I came across it as its needed to solve a puzzle geocache near Liverpool in NW England. See http://www.geocaching.com/seek/cache_details.aspx?guid=16c56ff2-d9ed-4c9c-aa6b-e44c480203e1 for details
Cheers
United Kingdom Phil Wright < not@guestbook> - Thu Mar 30 13:10:41 CEST 2006
Ukw D is a rare artifact now but in 1944 it was very used. A lot were destroyed after the war (The US sold the Enigma to others countries but not the ukw D and the Uhr box because it was more difficult to crack them and US wanted to spy others countries)
France John < not@guestbook> - Tue Mar 28 21:05:19 CEST 2006

Note from Dirk: Thanks for the find of the articles John! Very interesting! Lucky for us the D still came to late to change odds :-) Maybe stuff for a future project, hard to incorporate all different things in one sim. And we even didn't mention the Railway and Abwehr Enigma. But if a message surfaces, it's mostly Wehrmacht or with some luck a Naval one. So, the current sim can do the job. Frode Weierud from CSG has several different types of Enigma, great site!
It's not true reflector D was very used in Luftwaffe since 1944
look at Cryptologia articles :
part I: http://www.findarticles.com/p/articles/mi_qa3926/is_200104/ai_n8942078
part II: http://www.findarticles.com/p/articles/mi_qa3926/is_200107/ai_n8984792
part III: http://www.findarticles.com/p/articles/mi_qa3926/is_200110/ai_n8976505
France John < not@guestbook> - Tue Mar 28 21:01:45 CEST 2006
I would be great if you could implement the UKW D with the 3 rotor Luftwaffe Enigma.
Unknown Hin < not@guestbook> - Mon Mar 27 11:27:45 CEST 2006

Note from Dirk: I didn't add the D-reflector since it's very rare and seldom used by the Luftwaffe, just as the Enigma Uhr box. Nice tricks, but they came to late to make a difference.
That's by far the best looking and most interesting/informative Enigma sim I've seen! I've just updated my "Further Readings and Fun" ( http://www.dtek.chalmers.se/~d97jorn/pgp/furtherreadings.html ) page of my "eMail Encryption for the Lazy" site to link to your site.
Thanks for providing the site and the sims!
sweden Jörn < not@guestbook> - Tue Mar 14 20:41:04 CET 2006
Cool Work. Congratulations..
This work has historical and practical value..
Greece Tassos Z < not@guestbook> - Sun Mar 12 21:42:42 CET 2006
Great idea and nice toy!!! Thank you.
Germany Sönke Peters < soenkepeters@juno.com> - Mon Mar 6 18:41:19 CET 2006
Dirk's simulator is the only tool available to imitate functioning of an extensive Enigma family rather, than, like its competitors, single family member. Based on the thorough research, it behaves exactly like its original.
I'm using it extensively while deciphering original messages as well as imitating BP codebreaking operations.
Dirk, you know from my mail the only detail missing, hope some day you will find enough time to add this function.
Poland Marek Grajek < not@guestbook> - Thu Feb 2 22:25:26 CET 2006
Very good simulators. Both the Enigma and the M209 work with WINE under Linux.
Norway Harald Arnesen < gurre@operamail.com> - Sun Jan 29 16:06:20 CET 2006
Enigma Codebook Tool is the perfect combination to learn properly to run the Enigma Machine. Tankyou for these tools and go ahead!
Funken < not@guestbook> - Sat Jan 28 16:49:12 CET 2006
A very good and real looking ENIGMA simulation,
thanks.
Germany Maxx < MaddMaxx@web.de> - Tue Jan 24 13:22:42 CET 2006
Fantastische site! Geweldig zo'n heldere uitleg over deze codeermachine....
Netherlands Vincent < not@guestbook> - Mon Jan 23 14:11:22 CET 2006
I was searching the Internet for information about Enigma to make/program one by my own, and found your fine simulator. I don't think I can do better, great work! The best we can found! Puzzeling your VB code give me a great reading evening and some fine 'aha moments', and even more exiting was reading the article in your weblog about 50 cents quantum security, lets's try this at home!
Netherlands NivaRo < not@guestbook> - Wed Jan 18 21:44:10 CET 2006
Heel erg interesant, ik heb gisteren een film gezien over de enigma code en wat the Britten deden om het te kraken.
Dank U voor de kans om nu zelf met de Enigma machiene te spelen.
Fantasties stuk werk.
United States Richard Dekker < Richard_Dekker@yahoo.com> - Tue Jan 17 04:09:06 CET 2006
Of the various Enigma Simulators I have seen, this is certainly the best. The Enigma simulator has helped bring this fascinating subject to life for me, and I am most appreciative for Mr Rijmenants' work, and for sharing it with everyone.
United States S. Brannan < not@guestbook> - Sat Dec 31 09:31:31 CET 2005
Ik vind dit een schitterend idee en initiatief, erg origineel, ondanks dat enigma meer dan 60 jaar oud is!
Belgium maurits marain < mawm@telenet.be> - Sat Dec 17 14:06:54 CET 2005
A very great work. I used this programm to teach some aspects of cryptography to my students.
Brazil Marcio Nunes < mnunes@ipt.br> - Sat Dec 3 20:42:16 CET 2005
Excellent site and simulator. congratulations.
Brazil Marcio Pohlmann < not@guestbook> - Tue Nov 29 14:39:45 CET 2005
Exellent site!
Very useful for all who use the Enigma-E electronic enigma.
Thank you for all your efforts.
Cheerio, Marcus PE1RRT
Netherlands Marcus Simons < not@guestbook> - Thu Nov 24 21:41:28 CET 2005
Well done! It's a pleasure to use. I will be sharing this cool simulator with friends for sure.
Canada Mark Thibault < not@guestbook> - Fri Nov 18 07:47:58 CET 2005
Really a great Simulator! Fantastic! But at the moment i still dont know right about, how the Code for each message is created/read. Big praise!
United States Andyfrey < not@guestbook> - Thu Nov 17 23:38:57 CET 2005
Great simulator! Next time how about the Kurzsignalschlussel or Wetterkurzschlussel simulator?
United States Alphonse < mdc.america@gmail.com> - Thu Nov 17 06:17:16 CET 2005
Excellent simulator. Too bad that the codebuch generator available elsewhere doesn't take into account the Gamma and Beta rotors. We use this in the Wolfpack League Atlantik! Kampagne.
United States CaptSquid < ubootsmann@netzero.com> - Sun Nov 6 04:03:04 CET 2005

Note from Dirk: I just wrote my own codebook generator, the Enigma Codebook Tool is now available for download!
This simulator is a terrific device. Well designed and highly addicting. On top of that Dirk is a very helpful person in explaining questions that come up. Thank you!
Netherlands Jan-Bert Bongaarts < jan-bert%20dot%20bongaarts@planet.nl> - Thu Oct 6 12:43:47 CEST 2005
Je viens de lire le livre de Hugh Sebag-Montefiore sur ENIGMA - THE BATTLE FOR THE CODE. Votre programme est parfait comme illustration. Une merveille!
Switzerland Charles < not@guestbook> - Sat Sep 24 18:42:51 CEST 2005
Excellent work, old chap! It's come in quite useful for me!
United States Macavity < fizkreinernot@guestbookaol.com> - Mon Sep 19 20:50:44 CEST 2005
Impressive website sir, and I haven't even tried the simulator! All this reminds me when I was a school pupil coding messages by mail with a friend. Good old days, I always came up with the best ideas for codes.
I wonder if we've had an Enigma...
Spain Andres Serrano-Jordan < not@guestbook> - Sat Aug 27 21:38:01 CEST 2005
You have done a great job, my son! :) Dirk! I am really glad we did manage to "meet" again, thanks to bloody Internet. You know, we both are more soldiers than computer geeks, we prefer to stay in the trenches rather than in the nice and warm cities. I can still remeber all of you guys, my lovely "Motorola team", the UNTAES communications heart! I wish you all the best and please, never get lost again.
Shake your hand, old dog! All the best to you.
Russia Alex Karelin (Russian Marine Colonel) < alex@telitas.ru> - Wed Aug 3 09:30:19 CEST 2005
Hey buddy what a great idea have you done!!
Im an architect working in foreign country, im entertaining my self recently in cryptography and I landed on your site,
Im downloading at the moment the enigma & M 209 cant wait to see what it got...
thanks and more power...
Saudi Arabia Ernie < archernie@yahoo.com> - Sun Jul 31 21:08:01 CEST 2005
the enigmasim is the best sim ever! i dont understand the m-209 but it looks great too :)
P.S. my email adresse is real! try it!!!
Germany Necr0 < imcurrentlybeing@probedbyaliens.com> - Sun Jul 17 19:11:12 CEST 2005
I just downloaded from your site, havent' even tried it yet but I'll tell you that this looks like a marvelous toy. Thinking about turn based strategy or tactic games, this could provide a boon. Especially if one player chatted the coded message to his ally over open air. Of course this would only work if the other team didn't know this software existed. : ) very cool idea. I can't wait to give it a shot.
United States Matt Lowe < magedogtag@hotmail.com> - Sat Jul 2 00:43:27 CEST 2005
A great simulator, down to minute detail!
United States Thabo < not@guestbook> - Mon Jun 20 17:19:50 CEST 2005
Hallo,
habe mich sehr über die ENIGMA Simulation gefreut.
Diese ist sehr gut programmiert und das beste was ich bis jetzt zu diesem Thema gesehen und ausprobiert habe.
Nur schade, daß dieses Tool nicht in SH3 integriert werden kann!

Es verbleibt mit freundlichen Grüßen

Germany Peter < MaddMaxx@web.de> - Wed Jun 15 11:33:25 CEST 2005
Dirk, thank you, sir! You've created a real time machine there. Enjoyed decoding those actual messages. Beautiful execution.
United States Charley Hardman < saltypig@saltypig.com> - Fri May 27 04:39:25 CEST 2005
Fantastic simulator! amazing detail and functionality. I have been looking for something this good for years, thank you.
United Kingdom Mark < iamback@handbag.com> - Tue May 24 13:23:47 CEST 2005
Erg mooie site met veel waardevolle info.
Heb me altijd geintereseerd voor de U-boot oorlog en dan is een site als dit een must.
Netherlands Rob Kalverboer < Strikje@chello.nl> - Sat May 14 21:03:38 CEST 2005
Thanks a lot for providing the world with this fine piece of software.
It really helps to demonstrate working with this historical machine.
Real eye candy by the way.
Austria Bernd < sorry@not:in.guestbooks> - Sat May 14 15:14:01 CEST 2005
Excellent simulator! Feels like the real thing.
Canada Tim < timwade@rogers.com> - Fri May 13 20:56:53 CEST 2005
A great simulator, down to minute detail!
Ireland J. Blake < jb2002@oceanfree.net> - Wed Apr 27 01:10:27 CEST 2005
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