Although you mentioned that encrypt-decrypt-encrypt
mode is the most secure form of triple DES, how do
modes 4 & 5 work? Also, why are they less secure than
the former mode?
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On Sat, 29 Apr 2000, Edward Goulet wrote:
> Date: Sat, 29 Apr 2000 11:18:38 PDT
> From: Edward Goulet <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Triple DES
>
> In regards to implementing triple DES, is it just
simply a matter of
> encrypting with DES three times, like:
>
AFAIK, Triple DES (3des) is implemented with an
encrypt-decrypt-encrypt
triple
with three different keys. First DES encrypt with one
key, then DES
decrypt with a second key, then DES encrypt with a
third. This is MUCH
more secure than vanilla DES.
> E(K1,E(K2,E(K3,x))) ???
>
> Anyone have a particular recommended (or _not_
recommended) flavor or "mode
> of operation": ???
>
> 1. E(K1,E(K2,E(K3,x)))
> 2. E(K1,D(K2,E(K3,x)))
> 3. E(K1,D(K2,E(K1,x)))
> 4. E(K1, Tran( E(K2, Tran( E(K3, Compress( x ))))))
> 5. E(K1, Prngxor(K4, Tran( E(K2, Tran( Prngxor(K5,
E(K3, Compress( x
> ))))))))
>
>
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