[Cryptech Tech] trng ready for play

Joachim Strömbergson joachim at secworks.se
Tue Oct 7 05:18:56 UTC 2014


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Aloha!

Bernd Paysan wrote:
> Feeding in a full block of known stuff into SHA-2 as key for ChaCha
> however does reduce the entropy (we only have the counter, which
> isn't reset at reseeding).

This is incorrect. ChaCha is reseeded with:

(1) New 256 bit key
(2) New 512 bit block
(3) New 64 bit IV
(4) New 64 bit counter initial value.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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