PMAC
A message authentication code built on a block cipher that can process blocks in parallel.
CBC-MAC is sequential by nature: each block depends on the one before it, so a processor cannot spread the work across cores. PMAC, proposed by John Black and Phillip Rogaway in 2002, masks each block with an offset that depends only on its position, and then lets the block cipher handle the blocks independently.
The speed-up comes at the cost of a more involved construction. NIST standardised CMAC instead, which is simpler and has the same security goals. PMAC is mostly known from the research literature rather than from deployed systems.