Virtual Private Networks (VPNs) allow two or more parties to communicate securely over a public network. Using cryptographic algorithms and protocols, VPNs provide security services such as confidentiality, host authentication and data integrity. The computation required to provide adequate security, however, can significantly degrade performance. This paper characterizes the extent to which data compression can alleviate this performance degradation. More specifically, it studies the performance obtained when combining the IP Payload Compression Protocol (IPComp) with the IP Security Protocol (IPsec). It evaluates performance using 3 system models; each of these models consists of some or all of the computation and transmission operations required supporting VPN transactions.
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