17 Dec
2003
17 Dec
'03
5:17 p.m.
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?