---
title: "Signature Verification — Definition | FourSight Glossary"
url: https://foursight.cloud/glossary/signature-verification
description: "The process of checking that a message hasn't been tampered with by re-computing a cryptographic signature with a shared secret or public key and compar…"
lang: en
---

Back to glossary: https://foursight.cloud/glossary

Security & TLS

# Signature Verification

The process of checking that a message hasn't been tampered with by re-computing a cryptographic signature with a shared secret or public key and comparing. Used in webhook payloads, JWTs, and TLS handshakes.

Source

- NIST — FIPS 198-1 — The Keyed-Hash Message Authentication Code (HMAC) (https://csrc.nist.gov/publications/detail/fips/198/1/final)

## Related terms

SSL / TLS

Transport Layer Security (TLS) is the cryptographic protocol that powers HTTPS.
https://foursight.cloud/glossary/ssl-tls

TLS 1.2 vs TLS 1.3

TLS 1.3 (2018) is faster (one round-trip handshake) and more secure (removed legacy ciphers) than TLS 1.2.
https://foursight.cloud/glossary/tls-13

TLS Certificate (Leaf, Intermediate, Root CA)

An X.509 certificate is a signed document binding a public key to a domain.
https://foursight.cloud/glossary/certificate

Certificate Chain

The sequence of certificates linking your server's leaf cert back to a trusted root CA.
https://foursight.cloud/glossary/certificate-chain

Wildcard Certificate

A TLS cert valid for one subdomain level — `*.example.com` covers `api.example.com` but NOT `v2.api.example…
https://foursight.cloud/glossary/wildcard-certificate

Let's Encrypt

A free, automated, non-profit Certificate Authority issuing 90-day TLS certificates.
https://foursight.cloud/glossary/lets-encrypt

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