This list contains only a small selection of sites about cryptography within the Internet. Further links are contained within the online help of CrypTool and within the script delivered with CrypTool. We appreciate your advice on further interesting links.

Primes, Number Theory and Cryptology (Links and Books)

Web sites

• Good reading introductionary paper by Scott Aaronson: "The Prime Facts: From Euclid to AKS"
  http://www.scottaaronson.com/writings/prime.pdf
• The Prime Pages by Chris Caldwell
  http://www.utm.edu/research/primes/
• GIMPS (Great Internet Mersenne-Prime Search)
  http://www.mersenne.org/
• Educational project: "Zahlentheorie in der Schule -- Von Primzahlen zur Verschlüsselung mit RSA" -- (German only)
  http://www.hydrargyrum.de/kryptographie
• The Mathematical Atlas (index using mathematics subject classification), Number Theory
  http://www.math.niu.edu/~rusin/known-math/index/11-XX.html
• Randall K. Nichols (Lanaki): "Classical Cryptography Course vol 1+2", 1995
  http://www.fortunecity.com/skyscraper/coding/379/lesson1.htm
• John Savard: "A Cryptographic Compendium"
  This web site features an extensive section concerning cryptography, especially about Rijndael. Website seemingly no longer updated since 1999.
  http://www.quadibloc.com/crypto/jscrypt.htm
• Wonderful Cryptography - topics for a motivational 'Introduction to Cryptography' lecture by Eran Tromer 
  http://www.tromer.org/wondercrypt

Books

• Johannes Buchmann: "Introduction to Cryptography", 2nd ed, 2004, Springer.
• Claudia Eckert: "IT-Sicherheit Konzepte - Verfahren - Protokolle", 6th edition, 2009, Oldenbourg -- (German only)
  http://www.oldenbourg-wissenschaftsverlag.de/olb/de/1.c.1679883.de
• Bernhard Esslinger et al.: "Kryptologie für Jedermann", SAP pocket seminar produced within the governmental initiative "Deutschland - Sicher im Netz", 2007 -- (German only)
  https://www.sicher-im-netz.de/files/images/fibel_kryptologie.pdf
• Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone: "Handbook of Applied Cryptography", 1997, CRC Press
  http://www.cacr.math.uwaterloo.ca/hac/index.html
• Rolf Oppliger: "Contemporary Cryptography", 2005, Artech House
  http://www.esecurity.ch/Books/cryptography.html
• Christof Paar and Jan Pelzl: "Understanding Cryptography – A Textbook for Students and Practioners", December 2009, Springer
  This is pedagogically one of the best crypto books currently available. It describes all crypto schemes of practical relevance while avoiding to be shallow. The companion website has extensive PowerPoint slides for teachers, links to further information and videos of 28 lecturers (in German only).
  http://www.crypto-textbook.com/
• Klaus Schmeh: "Kryptografie – Verfahren, Protokolle, Infrastrukturen", 4th edition, 2009, dpunkt -- (German only)
• Klaus Schmeh: "Codeknacker gegen Codemacher. Die faszinierende Geschichte der Verschlüsselung", 2nd edition, 2007, W3L -- (German only)
  This is most current among the books dealing in a comprehensive manner with the history of cryptology. It contains a small collection of solved and unsolved crypto riddles.
• Victor Shoup: "A Computational Introduction to Number Theory and Algebra", 2005, Cambridge University Press
  http://shoup.net/ntb/
• William Stallings: "Cryptography and Network Security", 2006, Prentice Hall
  http://williamstallings.com/
• Mark Stamp and Richard M. Low: "Applied Cryptanalysis: Breaking Ciphers in the Real World", 2007, Wiley-Interscience
  The according website has a lot of powerpoint slides and challenge problems.
  http://cs.sjsu.edu/faculty/stamp/crypto/

Comprehensive Link Lists

• Cryptography and Security by Ron Rivest (website seemingly no longer updated)
  http://theory.lcs.mit.edu/~rivest/crypto-security.html
• The PKI page by Stefan Kelm
  http://www.pki-page.org/
• Simon Singh's Webpage, author of "The Codebook"
  http://www.simonsingh.net/Crypto_Corner.html

Crypto History

• Links and books see here.

Further Information

• heise Security UK - computer security news, information and services
  http://www.heise-security.co.uk/
• German federal ministries page about Internet security -- (German only)
  http://www.sicherheit-im-internet.de
• Computer Security Resource Center and AES page at NIST
  http://www.nist.gov
• Cryptome archives
  http://cryptome.org/
• ACA (The American Cryptogram Association) is dedicated to promoting the hobby and art of cryptanalysis. You have to become a member (subscription) to get the 2-monthly issue of "The Cryptogram".
  http://www.cryptogram.org/
• Dirk Rijmenants' Cipher Machines and Cryptology
  Historical and technical information about WW2 crypto machines and some nice according free software simulators.
  http://users.telenet.be/d.rijmenants/index.htm
• Geoff's Crypto page
  A page under (permanent) construction with WW2 crypto messages and historic cipher machine simulators.
  http://www.hut-six.co.uk/
• An interestingly designed program (incl. Java source code), which implemented the classic cipher of the Turning Grille
  http://www.turning-grille.com
• A web site with many classic ciphers implemented in PHP -- (German only)
  http://www.kryptographiespielplatz.de/
  

Reference to further publications about CrypTool

• See "Coverage in Print Media"
• Jamie Kendall (University of Portsmouth): "Cryptographic Techniques for Network Security using CrypTool", April 2008, 91 pages
  This project educates students in the basics of the field of classic and modern cryptography and the according cryptanalysis. The project explores the software CrypTool extensively and comprises of a set of three one hour lab sheets as well as an accompanying report with the solutions
• Telepolis, Werkzeugkasten für Codeknacker, August 2008 (German)
• CrypTool 2 at CeBIT 2010
  The University of Duisburg-Essen presented CrypTool 2 as e-learning platform, peers@play and the combination of both for distributed modern cryptanalysis.

Coverage in online media

• http://en.wikipedia.org/wiki/CrypTool