4ISO/IEC 3rd CD 13888-1. Information technology-Security techniques Part 1: General model. ISO/IEC JTC11/SC24 N1274, 1996.
5Burrows M, Abadi M, Needham R. A logic of authentication. ACM Transactions on Computer Systems, 1990,8(1):18-36.
6Kailar R. Accountability in electronic commerce protocols. IEEE Transactions on Software Engineering, 1996,22(5):313-328.
7Coffey T, Saidha P. Non-Repudiation with mandatory proof of receipt. Computer Communication Review, 1996,26(1):6- 17.
8Deng RH, Gong L, Lazar AA, Wang W. Practical protocols for certified electronic mail. Journal of Network and Systems Management, 1996,4(3):279-297.
9Asokan N, Shoup V, Waidner M. Asynchronous protocols for optimistic fair exchange. In: Proceedings of the 1998 IEEE Symposium on Security and Privacy. Los Alamitos: IEEE Computer Society Press, 1998. 86-99.
