[Cryptography] Shortening block cipher length...
Patrick Chkoreff
pc at fexl.com
Mon Jul 19 09:27:21 EDT 2021
Adam P. Goucher wrote on 7/18/21 6:01 AM:
...
> E = AES(P XOR ChaCha20(Ctr))
I suppose we could be silly and say that even that construction
"exposes" with repeated cipher text blocks if the plain text blocks
happen to equal ChaCha20(Ctr), but that is highly improbable and who
would care anyway.
The other example with P going up and down in concert with Ctr also
seems improbable, but decidedly less so.
-- Patrick
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