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NSA Type 1 cryptographic algorithm
Skipjack is an encryption algorithm for the transmission of information,
developed by the National Security Agency (NSA) in the USA.
It uses the Diffie-Hellman key exchange algorithm for the
distribution of the cryptographic session keys between peers.
The Skipjack algorithm was classified as
an NSA Type 2 encryption device.
The algorithm was developed for the NSA's ill-fated
Clipper Chip project
[1] and was initially
classified as SECRET, so that it could not be examined in the usual manner by
the encryption research community.
After much debate, the Skipjack algorithm was finally declassified and
published [2]
by the NSA on 24 June 1998. It used an 80-bit key
and a symmetric cipher algorithm, similar to DES.
Data is ecrypted in blocks of 64 bits, using an unbalanced Feistel network
with 32 rounds [3].
A full description of the algorithm is available for
download below.
The algorithm was initially developed for use in secure
telephones, such as the AT&T TSD-3600.
It was also used in the first Fortezza Crypto Card.
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© Copyright 2009-2012, Paul Reuvers & Marc Simons. Last changed: Mon,14 May 2012.09:44:31
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