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Provide(s) interoperable, high quality, cryptographically-based security for IPv4 and IPv6. The set of security services offered includes access control, connectionless integrity, data origin authentication, detection and rejection of replays (a form of partial sequence integrity), confidentiality (via encryption), and limited traffic flow confidentiality.
CNSSI 4009-2015 from IETF RFC 4301
A protocol that adds security features to the standard IP protocol to provide confidentiality and integrity services.
NISTIR 7316 under Internet Protocol Security