Quick question. There's a brief mention in Applied Cryptography that triple DES uses:
Eabc(x) = Ea(Db(Ec(x)))
as opposed to:
Eabc(x) = Ea(Eb(Ec(x)))
in order to preserve some symmetry properties. Can anyone give a better explanation?
I thought it goes like this: Eab(x) = Ea(Db(Ea(x))) Anyone? G.C.G. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Geoffrey C. Grabow | "What we demand are rigidly defined | | Oyster Bay, New York | areas of doubt and uncertainty!" | | | -------------------- | | grabow_geoffrey@tandem.com | Clipper, SkipJack & Digital Telephony | | | JUST SAY NO!!! | |----------------------------------------------------------------------| |PGP 2.6 fingerprint = AA 9E 35 12 F8 93 72 8D 1C E5 D5 BC 74 BE 49 D3| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~