Chiasmus (cipher)

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Chiasmus
General
Designers BSI
First published Leaked 2013
Cipher detail
Key sizes 160 bits
Block sizes 64 bits
Structure Substitution-permutation network
Rounds 12
Best public cryptanalysis
Secure against linear and differential cryptanalysis.

Chiasmus is a secret German government block cipher that was leaked by reverse engineering. It became notorious for its dilettant use in the BSI's software GSTOOL, which used it in insecure ECB mode and generated the key with a pseudo random number generator initialized to the current system time, which means an effective key length that can easily be broken by brute force. The BSI tried to prevent the publication of these findings with legal threats.

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