CrypTool 2 (CT2) is an open-source program offering an innovative visual programming GUI to experiment with cryptographic procedures and to animate their cascades.
Land der Ideen - Statements
"The non-numerate students found the pictorial descriptions of how the various processes work invaluable. They speak of CrypTool helping to remove their fear of the subject. A few have even reluctantly admitted that CrypTool brought the subject to life and made it fun."