Paul J Stevens wrote:
and you can select
the hash(es) you trust not to generate collisions.
Any hash you choose (as long as it shorter than the messages) WILL
generate collisions. It is a mathematical fact. You can not represent
all possible attachments with a short hash value.
(If you could, it wouldn't be a hash algorithm, it would be a
compression algorithm ;-)
I re-iterate: regardless of which digest algorithm is chosen, the code
MUST be able to
detect and correctly handle collisions. Collisions WILL occur,
regardless of the algorithm
chosen. It is a mathematically provable fact.
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