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How to use HMAC Generator

Type your message and a secret key, and the tool generates the HMAC-SHA256 signature for that pair.

Frequently asked questions

What is HMAC?

Hash-based Message Authentication Code — combines a cryptographic hash with a secret key to authenticate messages.

How is HMAC different from a hash?

HMAC requires a secret key. Without the key, you cannot reproduce the MAC, unlike a plain hash.

Where is HMAC used?

API authentication (AWS Signature, Stripe webhooks), JWT signing, and cookie signing.

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