IP Authentication Header

nounid 3031·updated May 12, 2026

candidate

GlossaryL1 — what DictionaryL2 — how used ThesaurusL3 — relations Universaleverything

Protocol used to provide connectionless integrity and data origin authentication for IP datagrams (hereafter referred to as just integrity) and to provide protection against replays. (RFC 4302). Scope Note: AH ensures data integrity with a checksum that a message authentication code, such as MD5, generates. To ensure data origin authentication, AH includes a secret shared key in the algorithm that it uses for authentication. To ensure replay protection, AH uses a sequence number field within the IP authentication header.

MWE

Classifications

per-axis with provenance

Entity Type

Network0%rule-basedmulti_axis_classifier_low_confidence.v1

Sensitivity

—60%llm-generatedllm:claude-haiku-4-5

Information Class

—50%llm-generatedllm:claude-haiku-4-5

Variants

4 surface forms

acronym: AH
plural: IP Authentication Headers
possessive: IP Authentication Header's
pluralpossessive: IP Authentication Headers'

Framework definitions

1 sense across 1 framework

ISACA Cybersecurity Glossary1 senseview framework →

§1: Protocol used to provide connectionless integrity and data origin authentication for IP datagrams (hereafter referred to as just integrity) and to provide protection against replays. (RFC 4302). Scope Note: AH ensures data integrity with a checksum that a message authentication code, such as MD5, generates. To ensure data origin authentication, AH includes a secret shared key in the algorithm that it uses for authentication. To ensure replay protection, AH uses a sequence number field within the IP authentication header.

Outgoing relationships

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Incoming relationships

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