SAMPLE JWT — Unknown kid
A genuinely valid RS256 signature whose kid names a key that has been rotated out of the JWK set. The right behaviour is a clean key-not-found error, not a silent fallback to whichever key happens to be first.
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Specifications
- Alg
- RS256
- Kid
- novus-p7-rotated-out-2019
- Issue
- kid absent from the JWK set
- Signature
- valid for the p7 leaf key
- Valid
- false
- Sub
- user-sample-0001
- Sample Only
- true
- Seed
- 70117
Testing contract
Expected to fail- Scenario
- Verify the token against the p7 JWK set, which has no key with this kid.
- Expected result
- The verifier reports key-not-found for the kid instead of trying other keys in the set.
What is a .jwt file?
A JWT (JSON Web Token) is a compact, URL-safe token made of three base64url-encoded parts — a header, a payload of claims, and a signature — separated by dots. It is widely used to carry authentication and authorisation claims between services.
How to use this file
Use a sample JWT to test token decoding, claim extraction, and signature verification. Never use an example token's secret in production.
How to use this file for testing
“SAMPLE JWT — Unknown kid” is a deterministic Novus Examples fixture for JWT / JWKS testing, Error handling. Unsigned and SAMPLE-signed JWT variants plus JWKS documents — published sample material only, for auth parser tests.
Documented properties for this file: seed 70117 · intentionally invalid. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This is published, SAMPLE-only security material — never a real secret. Point certificate, key, or token parsers at it, test PEM/DER decoding and PKCS handling, and confirm your tooling reads the documented fields; any sample password is printed on this page.
These JSON fixtures are synthetic SAMPLE auth or tool-call shapes for harnesses — never production secrets or live tokens. Validate schema fields and alg variants against the documented role.
Code examples
cut -d. -f1 jwt-unknown-kid.jwt | base64 -d; echo
cut -d. -f2 jwt-unknown-kid.jwt | base64 -d; echo # payload claimsRelated files
- jwtJWT — Intentionally Invalid SegmentsIntentionally invalid JWT (truncated) for parser error-path tests.
- jwtJWT (HS256 Expired) — SAMPLESAMPLE HS256 JWT with a past exp claim — for expiry-validation harnesses.
- jsonJWKS (Empty Keys) — SAMPLEEmpty JWKS keys array for edge-case JWKS loaders.
- jsonOAuth Error — Insufficient ScopeOAuth 2.0 SAMPLE error JSON (insufficient_scope) for client error-path tests.
- jsonOAuth Error — Invalid ClientOAuth 2.0 SAMPLE error JSON (invalid_client) for client error-path tests.
- jsonOAuth Error — Invalid GrantOAuth 2.0 SAMPLE error JSON (invalid_grant) for client error-path tests.
Generated by generation/security_p7.py. Free for any use, no attribution required — license.