truncating MACs for confidentiality, was Re: Public key encrypt-then-sign or sign-then-encrypt?

[Travis H.]

One more thing to consider; if you pick a reasonable MAC with twice
the security factor you need, then truncate the output to half the
size, I believe you get both confidentiality and
integrity/authentication guarantees of the desired strength.

-- 
Kill dash nine, and its no more CPU time, kill dash nine, and that
process is mine. -><- <URL:http://www.subspacefield.org/~travis/>
For a good time on my UBE blacklist, email john at subspacefield.org.
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