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CrypTool-Online optimized for smartphones:

An animation movie about bot networks by the Dutch Government Computer Emergency Response Team (65 MB WMV file):

Webpage to the book "The Code Book" by Simon Singh from the year 2000 and the corresponding Cipher Challenge:

Website of the Cryptoclub of the University of Illinois at Chicago (UIC):
(very colourful, for kids, Macromedia Flash required)

NSA site for kids:

Website on the National Cipher Challenge NCC (University of Southampton, IBM, GCHQ):

Secret Codes and the Enigma Machine (for pupils, site a little bit outdated):

Website about the CODEBREAKERS.EU cryptology game (currently 4th edition):
(A game for teams with three members, offering 3 levels a 6 tasks (lectures), supported by hints and "cryptologic bombs" to deal with the Enigma)

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