3[1]Kohl J, C Neuman. The Kerberos Network Authentication Service (V5)[J]. RFC 1510, Digital Equipment Corporation, USC/Information Sciences Institute, September 1993.
4[2]ITU-T, Recommendation X.509. The Directory-authentication Framework[J]. Consultation Committee, International Telephone and Telegraphm, Inernational Telecommunications Union.
5[3]R L Rivest. RFC 1321. The MD5 Message-digest Algorithm[J]. Internet Request for Comments 1321, Apr. 1992.
6[4]C Rigney, A Rubens, W Simpson, S Willens. RFC 2138, Remote Authentication Dial in User Service (RADIUS)[J]. 1997-04-18.
