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UUID Use Case

UUID API Secret

When you sign requests with HMAC, the secret must be high-entropy and secret. A v4 UUID works for low-risk signing; prefer 32+ bytes for serious use.

HMAC secretStore hashedRotatable

Version

How many

Uppercase Hyphens Braces { }

Result

Generated locally with the Web Crypto API — nothing leaves your browser.

What Is UUID API Secret?

The API secret is concatenated with the payload and hashed; only the holder of the secret can produce a valid signature.
A v4 UUID (16 bytes) is acceptable for many cases; for stronger security generate 32 bytes of random.

How to generate

Generate the secret (UUID or os.urandom(32)).
Store a hash; compare signatures, never the secret.
Support rotation by issuing a new secret.

Use Cases

Webhook signature verification.
Server-to-server HMAC.
Short-lived signed URLs.

Code Examples

Python

import hmac, hashlib, uuid
secret = str(uuid.uuid4()).encode()
sig = hmac.new(secret, payload, hashlib.sha256).hexdigest()

Frequently Asked Questions

Is a UUID secret strong enough?

For HMAC it is fine at 122 bits, but many standards prefer 32 bytes; size it to your threat model.

Store the secret or a hash?

Store a hash and verify signatures against it; never persist the raw secret if you can avoid it.

Related tools

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