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Description: An IPSec implementation for Linux.
Security Relevance: IPSec provides IP network-layer encryption, and heavy duty encryption at that. NIST's free implementation isn't crippled (although it's missing a few features) and offers excellent host-to-host, host-to-router, and router-to-router IPSec services. Use this if you are truly paranoid. Learn more in Chapter 15, "Secure Protocols."