Rest API - Authentication and Authorization
You receive a JWT but the signature verification fails. What is the most likely cause?
You receive a JWT but the signature verification fails. What is the most likely cause?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Understand signature verification
The signature is created using a secret key and the header and payload.Step 2: Identify cause of verification failure
If the secret key used to verify differs from the signing key, verification fails.Final Answer:
The secret key used to sign the token is different -> Option AQuick Check:
Signature fails if secret keys differ [OK]
Quick Trick: Signature fails if secret keys don't match [OK]
Common Mistakes:
- Assuming empty payload causes signature failure
- Thinking missing header always breaks signature
- Confusing encoding with signature verification
Master "Authentication and Authorization" in Rest API
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