Martin Rex <mrex(_at_)sap(_dot_)com> writes:
Truncating HMACs and PRFs may have become first popular in the IETF within
IPSEC.
It wasn't any "may have become first popular", there was only room for 96 bits
of MAC data in the IP packet, so MD5 was truncated to that size. Since then an
army of cargo-cult designers have copied it without knowing why, but if IPsec
did it it had to be good, right?
Peter.
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