Chae Hoon Lim Pil Joong Lee Server (Prover/Signer)-Aided Verification of Identity Proofs and Signatures. 64-78 http://link.springer.de/link/service/series/0558/bibs/0921/09210064.htm 1995 EUROCRYPT db/conf/eurocrypt/eurocrypt95.html#LimL95