“The freely-available demonstration program CrypTool is highly recommended for practical exercises.”
Wolfgang Ertel, Vorwort in "Angewandte Kryptographie"
CryptoPrograms with Online Analyzers
The website CryptoPrograms http://www.cryptoprograms.com is dedicated to create and solve classical ciphers online. New on this site are analyzers for solving classical ciphers without any knowledge of the keyword and, in many cases, the key length. Routines for solving around 40 cipher types are provided.
Release Candidate 8 available
JCrypTool 1.0.0 Release Candidate 8 is available on our download page.
The Cyber Security Challenge Germany (CSCG) is the German hacking
competition for pupils and students. There are 12 online challenges
starting on May 2nd, 2016. The juveniles have to solve different
IT-Security tasks till August.