small security glitches

[Peter Lebbing]

On 03/03/12 01:25, brian m. carlson wrote:
> It is not true that encryption amounts to XORing the message text
> against the secret key.
> [snip]
>  Also, CFB mode, what is XORed is the output of a block cipher
> encryption of the previous ciphertext.

And the paper exploits exactly this fact by interleaving original ciphertext and
chosen ciphertext so they can XOR to get the original keystream for a block of
original ciphertext.

The paper is only 12 pages, so if the summaries Post Cartner or Tom McCune give
are unclear, it won't take forever to read the actual paper to clear it up.

Peter.

-- 
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