Authentication · interview question
How does a server verify the authenticity of a JWT without a database lookup?
Multiple choiceMediumchapter-17-curatedpremiumauthenticationjson-web-tokens-jwt
Answer and explanation
Correct answer
D. By validating the token's signature
Why
A server verifies a JWT's authenticity by validating its signature. The signature is generated using a secret key, which ensures that the token has not been altered since it was issued.
Test yourself on Authentication
A free test with instant, explained results. No account needed.
More Authentication questions
- In the context of JWT, what is the primary purpose of the signature?
- How can a Java developer verify the signature of a JWT using HMAC SHA-256?
- How would you explain a significant consequence of using stateless JWT tokens for authentication in an interview?
- Which statement about JWT payloads is correct?
- Which statement best describes the use of CSRF tokens in web applications?
- Why is using BCrypt preferable over a fast hashing algorithm like SHA-256 for password hashing?