Individual skill
implementing-jwt-signing-and-verification
Implements secure JWT (RFC 7519) signing and verification using HMAC-SHA256, RSA-PSS, ES256, and EdDSA, including token expiration, claims validation, and defenses against algorithm-confusion, none-algorithm, and key-injection attacks. Use when adding or hardening JWT-based authentication/authorization, or when auditing token verification code for common JWT vulnerabilities.
skills/implementing-jwt-signing-and-verification/SKILL.md
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- Last checked
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- Repository last updated
- Aug 31, 2026
- License
- Apache-2.0
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- ai-agents Repository topic
- claude-code Repository topic
- cybersecurity Repository topic
- incident-response Repository topic
- mitre-attack Repository topic
- penetration-testing Repository topic
- red-team Repository topic
- security Repository topic
- cloud-security Repository topic
- malware-analysis Repository topic
- cryptography Declared skill tag
- jwt Declared skill tag
- authentication Declared skill tag
- token-security Declared skill tag
- digital-signatures Declared skill tag
- security Derived category
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LICENSEasset · 11,255 bytesSKILL.mdcore · 3,456 bytesSKILL.mdcore · 3,456 bytesassets/template.mddoc · 1,217 bytesreferences/api-reference.mddoc · 1,685 bytesreferences/standards.mddoc · 1,183 bytesreferences/workflows.mddoc · 1,163 bytesscripts/agent.pyruns · 7,492 bytesscripts/process.pyruns · 10,936 bytes
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# Implementing JWT Signing and Verification
## Overview
JSON Web Tokens (JWT) defined in RFC 7519 are compact, URL-safe tokens used for authentication and authorization in web applications. This skill covers implementing secure JWT signing with HMAC-SHA256, RSA-PSS, and EdDSA algorithms, along with verification, token expiration, claims validation, and defense against common JWT attacks (algorithm confusion, none algorithm, key injection).
## When to Use
- When deploying or configuring implementing jwt signing and verification capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
## Prerequisites