5. IPsec---Definition
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## 5. IPsec---Definition

Internet Protocol security extensions to IPv4; required for IPv6. A protocol for negotiating encryption and authentication at the IP (host-to-host) level. SSL secures only one application socket; SSH secures only a login; PGP secures only a specified file or message. IPsec encrypts everything between two hosts.

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4. Caveat | Home | 6. Installing IPsec

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