Specialized Cybersecurity & Cognitive Security
Cryptographic API Security: JWT and OAuth
JWT and OAuth are the plumbing of modern APIs, and small mistakes in either become account takeovers or data leaks. The failures are usually predictable: weak signing keys, missing audience checks, token leakage in logs, and overly broad scopes. Security comes from strict validation, short-lived tokens, and treating every token as a credential that must be protected in transit and storage.
要点
- Validate issuer, audience, expiry, and signature on every token, with no optional checks.
- Use asymmetric signing and rotate keys through a published JWKS endpoint.
- Keep access tokens short-lived and use refresh tokens with rotation and reuse detection.
- Request least-privilege scopes and enforce them on every endpoint.
- Store tokens in secure, httpOnly storage and never in URLs or logs.
- Pin OAuth redirect URIs exactly and require PKCE for public clients.
- Revoke tokens on logout and on suspected compromise.
- Audit token handling in code review, since most bugs are in validation logic.
よくある質問
Is JWT always the right choice?
No. Opaque tokens with introspection are safer when you need revocation and small payloads.
What is the most common JWT bug?
Accepting none or weak algorithms and skipping audience or issuer checks.
Should refresh tokens be stored client-side?
Only in secure storage with rotation; prefer backend-for-frontend patterns when possible.
How do I handle token leakage?
Revoke the token, rotate keys if needed, and audit access logs for abuse.
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