Giovanni Di Crescenzo Giuseppe Persiano Ivan Visconti Constant-Round Resettable Zero Knowledge with Concurrent Soundness in the Bare Public-Key Model. 237-253 http://dx.doi.org/10.1007/978-3-540-28628-8_15 2004 conf/crypto/2004 CRYPTO db/conf/crypto/crypto2004.html#CrescenzoPV04