HMAC Use Cases: Webhooks, API Requests, and Cookie Signing
Practical HMAC applications: verifying webhook payloads, signing cookies, authenticating API requests, and preventing replay attacks.
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Tags: security, cryptography, hmac
HMAC Use Cases: API Signatures, Webhooks, and Cookie Integrity HMAC (Hash-based Message Authentication Code) combines a cryptographic hash function with a secret key to produce a message authentication code. Unlike plain hashing, HMAC proves both that the message has not been tampered with and that it was produced by someone who holds the secret key. This combination makes it essential for API authentication, webhook verification, and signed cookies. How HMAC Works HMAC is defined as: You do not need to implement this directly — every standard library provides HMAC. What matters is that: Without the secret key, you cannot compute the correct HMAC The HMAC is bound to both the key and the message — change either and the HMAC changes Unlike plain signatures, HMAC is symmetric — both parties…
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