[issue13703] Hash collision security issue

[Paul McMillan]

Paul McMillan <paul at mcmillan.ws> added the comment:

> - for small strings we could use a different seed than for larger strings

Or just leave them unseeded with our existing algorithm. Shifting them
into a different part of the hash space doesn't really gain us much.

> - for larger strings we could use Paul's algorithm but limit the XOR op to the first and last 16 elements instead of all elements.

Agreed. It does have to be both the first and the last though. We
can't just do one or the other.

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