Skill UI

This skill provides comprehensive implementation for secure JWT (RFC 7519) signing and verification using multiple algorithms (HMAC-SHA256, RSA-PSS, ES256, EdDSA). It covers token expiration, claims validation, and crucial defenses against common attacks like algorithm confusion and 'none' algorithm bypass, essential for hardening web application authentication systems.

A comprehensive checklist detailing advanced attack methodologies for JSON Web Tokens (JWT). Covers critical misconfigurations such as algorithm confusion (alg:none, RS256→HS256), weak secret brute forcing, header injection (kid, jku, jwk), cache poisoning, and improper validation. Also provides specific vectors for extracting JWTs from mobile environments (Android/iOS). Ideal for penetration testers conducting deep security assessments on authentication systems.

Covers advanced API exploitation methodologies, focusing on business logic abuse, API call chaining, and sophisticated attack patterns that bypass traditional security controls. Topics include GraphQL abuse (batching, introspection), JWT manipulation (algorithm confusion), race conditions, and identifying API key leakage. This guide is designed for authorized penetration testers targeting deep-seated, logic-layer vulnerabilities.

Offensive security skill for hunting API security misconfigurations: mass assignment, JWT none/algorithm confusion, server-side prototype pollution, and server-side parameter pollution in backend URL construction. Requires explicit written authorization and a controlled lab or target scope.