8473)", ISO/IEC JTC1/SC6/WG2, October 1989.
[12] Estrin, D., and Tsudik, G., "Secure Control of Transit Internet-
work Traffic, TR-89-15, Computer Science Department, University
of Southern California.
[13] Linn, J., "Privacy Enhancement for Internet Electronic Mail:
Part I - Message Encipherment and Authentication Procedures",
RFC1113, August 1989.
[14] Kent, S., and Linn, J., "Privacy Enhancement for Internet Elec-
tronic Mail: Part II - Certificate-based Key Management", RFC
1114, August 1989.
[15] Linn, J., "Privacy Enhancement for Internet Electronic Mail:
Part III - Algorithms, Modes, and Identifiers", RFC1115, August
1989.
[16] Rivest, R., "The MD4 Message-Digest Algorithm", RFC1320, April
1992.
[17] Rivest, R., "The MD5 Message-Digest Algorithm", RFC1321, April
1992.