Re: Is this protocol okay?
From: Alexis Machado (alexis@brfree.com.br)
Date: 02/12/03
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From: "Alexis Machado" <alexis@brfree.com.br> Date: Tue, 11 Feb 2003 23:50:19 -0000
"Mads Rasmussen" <mads@opencs.com.br> wrote in message news:b2bdr0$m89$1@newsreader.mailgate.org...
> given the scheme proposed by Alexis we have
>
> c1 = Ek(m xor IV)
> c2 = Ek(m xor c1)
> c3 = Ek(m xor c2)
> c4 = Ek(IV xor c3)
>
> c2 can be changed (by error in transmission or deliberately) and the scheme
> will not detect it.
Oops. Each plaintext block depends on two ciphertext
blocks only ...
Obrigado Mads.
Thanks David.
--- Alexis
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