Cryptography, Blind Signatures, Google, VPN, Privacy.
with message m. They think that these two are linked, meaning that BM was a blinded token made from m. Working together, they will try to reconstruct r from these pieces. Signer knows: BM, d (privkey) Redemption point knows: m, sig(h(m)), h(m) Everyone knows: e (pubkey) Solve for r: BM = h(m) * r^e