JWT Is Not Encrypted (And That's By Design)

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Understand why JWT is not encrypted and how its security relies on signatures, not encryption

intermediate Published 13 Apr 2026
Action Steps
  1. Inspect a JWT token to see its plain text payload
  2. Learn about the alg:none attack and its implications on JWT security
  3. Implement secure practices for handling and verifying JWT signatures
  4. Use a secure algorithm for signing JWTs, such as RS256 or ES256
  5. Test JWT implementation for vulnerabilities, including the alg:none attack
Who Needs to Know This

Developers and security engineers benefit from understanding JWT's design to ensure secure implementation in their applications

Key Insight

💡 JWT security relies on the integrity of the signature, not the encryption of the payload

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💡 JWTs are not encrypted, but their security comes from signatures! #JWT #security
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