[Cryptography] NSA versus DES etc.... was: iOS 8
Tony Arcieri
bascule at gmail.com
Tue Sep 23 20:05:10 EDT 2014
>
> > All NSA did was change the S boxes and drop the key from 64 to 56 bits.
>
Lucifer supported a 128-bit key size, and IBM had it deployed for various
commercial purposes using 128-bit keys before DES was standardized.
The NSA originally pushed for a 48-bit key size, when IBM wanted at least
64-bits. They split the difference and used 56-bits, and chalked the 8-bits
between 56-bits and 64-bits up to "checksum bits"
--
Tony Arcieri
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