2Diffie W, Hellman M, New Directions in Cryptography [J]. IEEE Trans. On Inform Theory,1976,22:644 -654.
3Pieprzyk J , Sadeghiyan B, Design of Hashing algorithms [ A ]. Springer - Verlag, 1997.
4Heber S,Stornetta W S,How to Timestamp a Digital Document [ J ], Journal of Cryptology, 1991,3 (2) : 99 - 111.
5Bayer D, Heber S , Stornetta W S, Improving the Efficiency and Reliability of Digital Time - stamping, In Sequences Ⅱ, Methods in Communication, Security, and Computer Science[ A] ,Springer - Vedag, 1993,309 - 334.
