Re: Congratulations! we have got hash function screwed up

[Edward Shishkin <edward@namesys.com>]

Grzegorz Jaśkiewicz wrote:

>All I know is that xxtea is fixed tea algo. If that fixes weakness in
>crypto algo, than so it should make hashing better.
>  
>

Not necessary. The xtea, xxtea don't fix mixing portion of tea in 
accordance with the
following papers: http://algolist.manual.ru/defence/well_known/tea.zip

>No doubt there is no ideal hash algo, but if base algo has weaknes,
>using fixed one only can be better, Right ?
>
>  
>
Nop ;)
We don't need to keep a track of teacore upgrades against the attacks 
that allow to reveal secret key.
Tea hash uses tea algorithm only for mixing, not for private ciphering, 
so plain text is known
(this is hardcoded vector  u32 k[] = { 0x9464a485, 0x542e1a94}), keys 
(constructed by names)
are known, output values are known.
Nothing to reveal - nothing to upgrade..

Edward.