Skipjack

From CryptoDox, The Online Encyclopedia on Cryptography and Information Security

Skipjack is a block cipher developed by the U.S. National Security Agency (NSA). Initially classified, it was originally intended for use in the controversial clipper chip. Subsequently, the algorithm was declassified and now provides a unique insight into the cipher designs of a government intelligence agency.

Skipjack uses an 80-bit key to encrypt 64-bit data blocks. It is an unbalanced Feistel Network with 32 rounds. It was specially designed for replacing DES and it is able to operate in ECB, CBC,CFB and OFB modus as DES.

Software

• Skipjack Perl Module

External Links

• Skipjack Specification
• Skipjack Overview