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[openpgp] WWhy or why not SHA{2,3}-512 (was: SHA3 algorithm ids)

2015-08-11 10:50:43
On Tue, 11 Aug 2015 15:21, pgut001(_at_)cs(_dot_)auckland(_dot_)ac(_dot_)nz 
said:

What's the clear need for -512?  By which I mean a demonstrated practical need
for a hash size of 64 bytes, not a hypothesised need given an imaginary
attack.  I can see a need for SHA-256 (to replace SHA-1), but for something
like SHA3-512 all I can see are downsides (compared to SHA2-256).

One advantage of SHA-512 (SHA2) is that it faster than SHA-256 on modern
machines.  Thus SHA-512 truncated to 256 might be an option.  This would
eventually allow to write a small application which uses SHA-512 as its
only hash algorithm.


Salam-Shalom,

   Werner


-- 
Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.

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