lkml.org 
[lkml]   [2003]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: [RFC][PATCH] Make cryptoapi non-optional?
    Date
    Val Henson  wrote:
    >Throwing away 80 bits of the 160 bit output is much better
    >than folding the two halves together. In all the cases we've
    >discussed where folding might improve matters, throwing away half the
    >output would be even better.

    I don't see where you are getting this from. Define
    F(x) = first80bits(SHA(x))
    G(x) = first80bits(SHA(x)) xor last80bits(SHA(x)).
    What makes you think that F is a better (or worse) hash function than G?

    I think there is little basis for discriminating between them.
    If SHA is cryptographically secure, both F and G are fine.
    If SHA is insecure, then all bets are off, and both F and G might be weak.
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:47    [W:0.024 / U:3.148 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site