References

   [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.