On Mar 23, 2006, at 10:23 AM, Arvel Hathcock wrote:
> 3) + can hash a body once for redistribution; a fairly marginal
> feature that might help mass mailers, but Moore's law is just
> as likely to help, um, more.
For mailing lists which sign their outbound traffic surely this
benefit is more than marginal; especially for large lists? I don't
have as much knowledge here as Mike and I'm no crypto expert (thank
God for OpenSSL BTW) but isn't the hashing part what takes the
longest (sorry if I'm wrong on that).
Here is an interesting link on performance.
http://www.eskimo.com/~weidai/benchmarks.html
The MB/S rating of the hashing function is therefore dependent upon
the size of the message. The RSA overhead is dependent upon the key
size.
The advantage found by the hash parameter from the verification
perspective is found when considering the related overhead related to
weeding through a series of possibly "broken" signatures (largely
related to more expensive DNS transactions) and various added
signatures when this becomes more common place.
-Doug
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