RFC 4303: IP Encapsulating Security Payload (ESP) - RFC Editor
https://www.rfc-editor.org/rfc/rfc4303
WEBSecurity Payload (ESP) protocol, which is designed to provide a mix. of security services in IPv4 and IPv6. ESP is used to provide. confidentiality, data origin authentication, connectionless. integrity, an anti-replay service (a form of partial sequence. integrity), and limited traffic flow confidentiality. This document.
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