Did you know?

That CrypTool was originally designed as an internal business application for information security training. CrypTool has since developed into an important open-source project in the field of cryptology. Over 50 volunteer developers worldwide contribute to the program.

What is CrypTool 1?

CrypTool 1 (CT1) is an open-source Windows program for cryptography and cryptanalysis. It’s the most wide-spreaded e-learning software of its kind.

What is CrypTool 2?

CrypTool 2 (CT2) is an open-source program offering an innovative visual programming GUI to experiment with cryptographic procedures and to animate their cascades.

What is JCrypTool?

JCrypTool (JCT) is an open-source e-learning platform, allowing to experiment comprehensively with cryptography on Linux, MAC OS X, and Windows.

What is CrypTool-Online?

CrypTool-Online (CTO) runs in a browser and provides a variety of encryption and cryptanalysis methods including illustrated examples and tools like password generator and password meter.

What is MysteryTwister C3?

MysteryTwister C3 (MTC3) is an international Crypto Cipher Contest offering a broad variety of challenges, a moderated forum, and an ongoing hall-of-fame.

  • Friedrich L. Bauer: "Decrypted Secrets: Methods and Maxims of Cryptology", 1st edition, 1997, Springer, ISBN-13: 978-3540604181
  • Bengt Beckman: "Codebreakers: Arne Beurling and the Swedish Crypto Program During World War II", 2002, AMS, ISBN 0-8218-2889-4
    Translated from the Swedish by Kjell-Ove Widman
    Review by F.L. Bauer: http://www.ams.org/notices/200308/rev-bauer.pdf
  • David Kahn: "The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet", edition Rev Sub, 1996, Scribner. ISBN 978-0-684-83130-5
  • Michael Proese: "Chiffriermaschinen und Entzifferungsgeraete im Zweiten Weltkrieg: Technikgeschichte und informatikhistorische Aspekte",
    Dissertation at the philosophical faculty of Technische Universitaet Chemnitz, 2004
    (Ciphering and deciphering machines used in WW2, historic aspects of technology and computer science. German only)
  • Klaus Schmeh: "Codeknacker gegen Codemacher. Die faszinierende Geschichte der Verschluesselung", 2nd edition, 2007, W3L, ISBN 978-3-937137-89-6
    (This is one of the most current among the books dealing in a comprehensive manner with the history of cryptology. It also contains a small collection of solved and unsolved crypto riddles. German only)
  • Simon Singh: "The Code Book: The Secret History of Codes and Code-breaking", 2000, New edition, Fourth Estate, ISBN-13: 978-1857028898


A rich source of old books with photographs of the book cover

At the website of Tobias Schroedel are short descriptions of new and old crypto books (including ones for kids). Especially the photographs for the old books are well worth seeing.
is the link to this special collection of "Literature about cryptology and secret writing".

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