fyi/fwiw: Buried in the abstract for http://eprint.iacr.org/2017/566 is
this:
"A side product of our implementation effort is a new optimized circuit
for SHA256 with less than a quarter than the number of AND gates of the
best previously publicly available one. Our new SHA256 circuit may be of
independent use for circuit-based MPC and FHE protocols that require
SHA256 circuits."
[ i take MPC and FHE to be "multi-party computation" and "Fully
homomorphic encryption", fwiw ]
hth,
=JeffH
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