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Figure 1, accessed 8 February 2007. Figure 2 based on Stallings, W., SNMP, SNMPv2, SNMPv3, and RMON 1 and 2, 3rd edition, May 2001, Addison Wesley; Figures 7 and 8 based on Schneier, B. (1996) Applied Cryptography, 2nd edition, John Wiley & Sons; Figure 9 based on King, T. and Newson, D. (1999) Data Network Engineering, Kluwer; Figure 10 based on Stallings, W (1995) Cryptography and Network Security, Prentice Hall.
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