Blind unanticipated signature systems

摘要: An improved blind signature system not requiring computation during blinding for anticipating which of a plurality possible signatures will be made signing, while still allowing the party to unblind and recover unanticipated kind on what was blinded. exemplary embodiment blinds by forming product including generators raised powers normally secret from signing party, unblinds with multiplicative inverse signed form original powers. Re-blinding allows value transformed into particular blinded value.