System for ensuring that the blinding of secret-key certific ates is restricted, even if the issuing protocol is performe d in parallel mode

摘要

PCT No. PCT/NL96/00129 Sec. 371 Date Feb. 19, 1998 Sec. 102(e) Date Feb. 19, 1998 PCT Filed Mar. 27, 1996 PCT Pub. No. WO96/31034 PCT Pub. Date Oct. 3, 1996A cryptographic method is disclosed that enables the issuer in a secret-key certificate issuing protocol to issue triples consisting of a secret key, a corresponding public key, and a secret-key certificate of the issuer on the public key, in such a way that receiving parties can blind the public key and the certificate, but cannot blind a predetermined non-trivial predicate of the secret key even when executions of the issuing protocol are performed in parallel.