TSIG (Transaction Signature)
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://tldfyi.com/iframe/glossary/tsig/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://tldfyi.com/glossary/tsig/Add a dynamic SVG badge to your README or docs.
[](https://tldfyi.com/glossary/tsig/)Use the native HTML custom element.
Transaction Signature (TSIG, RFC 8945) is a mechanism for authenticating [[dns|DNS]] messages between servers using a shared secret key and HMAC cryptography. TSIG is commonly used to secure [[axfr|zone transfers]] between primary and secondary nameservers and to authenticate dynamic DNS update requests. Unlike [[dnssec|DNSSEC]], which secures data in transit to end users, TSIG secures server-to-server DNS communication at the transport layer.
Example
A primary nameserver configured with TSIG will reject zone transfer requests from secondary servers that don't present the correct shared secret, preventing unauthorized zone replication.