← All skills

implementing-jwt-signing-and-verification

85 / 100 · Low risk

Fine to try.

By mukul975/Anthropic-Cybersecurity-Skills (GitHub) · security · 35,906 stars · scanned at commit 54a7988

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.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'implementing-jwt-signing-and-verification' ] || [ -L ~/.agents/skills/'implementing-jwt-signing-and-verification' ]; then echo 'A skill folder named implementing-jwt-signing-and-verification already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/mukul975/Anthropic-Cybersecurity-Skills' "$d" && git -C "$d" checkout --quiet '54a798831d2266a3ca61ce68a7acb80b81160d57' -- 'skills/implementing-jwt-signing-and-verification' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/implementing-jwt-signing-and-verification' ~/.agents/skills/'implementing-jwt-signing-and-verification' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'implementing-jwt-signing-and-verification' ~/.claude/skills/'implementing-jwt-signing-and-verification' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

Badge for your README

The badge for mukul975/Anthropic-Cybersecurity-Skills shows the score of its lowest-scoring skill.

[![SkillTrust](https://zalavijaysinh.github.io/skilltrust/badges/mukul975/Anthropic-Cybersecurity-Skills.svg)](https://zalavijaysinh.github.io/skilltrust/repos/mukul975/Anthropic-Cybersecurity-Skills/)

Score history