3DES
GRABOW_GEOFFREY at tandem.com
GRABOW_GEOFFREY at tandem.com
Wed Sep 28 16:46:48 PDT 1994
>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 at tandem.com | Clipper, SkipJack & Digital Telephony |
| | JUST SAY NO!!! |
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|PGP 2.6 fingerprint = AA 9E 35 12 F8 93 72 8D 1C E5 D5 BC 74 BE 49 D3|
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