Challenge-Handshake Authentication Protocol

nounid 1793·updated May 9, 2026

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The Challenge-Handshake Authentication Protocol uses a challenge/response authentication mechanism where the response varies every challenge to prevent replay attacks.

MWE

Classifications

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Entity Type

Credential85%llm-generatedllm:claude-haiku-4-5

Sensitivity

—60%llm-generatedllm:claude-haiku-4-5

Information Class

—50%llm-generatedllm:claude-haiku-4-5

Variants

4 surface forms

acronym: CHAP
plural: Challenge-Handshake Authentication Protocols
possessive: Challenge-Handshake Authentication Protocol's
pluralpossessive: Challenge-Handshake Authentication Protocols'

Framework definitions

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SANS Glossary of Security Terms1 senseview framework →

§1: The Challenge-Handshake Authentication Protocol uses a challenge/response authentication mechanism where the response varies every challenge to prevent replay attacks.

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