---
id: "tsig"
kind: "glossary-term"
title: "TSIG"
language: "en"
category: "DNS and technical foundations"
updated: "2026-10-04T14:01:23Z"
canonical: "https://tldlog.com/glossary/tsig/"
translations:
  es: "https://tldlog.com/es/glosario/tsig/"
  de: "https://tldlog.com/de/glossar/tsig/"
  fr: "https://tldlog.com/fr/glossaire/tsig/"
  it: "https://tldlog.com/it/glossario/tsig/"
  pt-BR: "https://tldlog.com/pt/glossario/tsig/"
  ru: "https://tldlog.com/ru/glossariy/tsig/"
  zh-Hans: "https://tldlog.com/zh/cihui/tsig/"
---

# TSIG

Transaction Signature

A method that lets two DNS servers prove their identity to each other with a shared secret key. It is used mainly to protect zone transfers and automatic updates, so that only approved servers can copy or change a zone.

## related terms

- [zone transfer](https://tldlog.com/glossary/zone-transfer/)
- [primary and secondary servers](https://tldlog.com/glossary/primary-and-secondary-server/)
- [dynamic DNS](https://tldlog.com/glossary/dynamic-dns/)
- [authoritative server](https://tldlog.com/glossary/authoritative-server/)