[1] Simpson, W., "The Point-to-Point Protocol (PPP)", RFC 1331, Daydreamer, May 1992. [2] Reynolds, J., and J. Postel, "Assigned Numbers", RFC 1340, USC/Information Sciences Institute, July 1992. [3] Rivest, R., and S. Dusse, "The MD5 Message-Digest Algorithm", MIT Laboratory for Computer Science and RSA Data Security, Inc. RFC 1321, April 1992. [4] Galvin, J., McCloghrie, K., and J. Davin, "SNMP Security Protocols", Trusted Information Systems, Inc., Hughes LAN Systems, Inc., MIT Laboratory for Computer Science, RFC 1352, July 1992.