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ClaudSkills / Security / crypto-keymgmt

Crypto Primitive Selection

Category: Security  ·  Sub-category: crypto-keymgmt  ·  Last updated:
Decision-aid skill for choosing cryptographic primitives (AEAD, KDF, MAC, signature) and identifying anti-patterns (CBC-without-MAC, ad-hoc KDF, key reuse, PBKDF2-on-high-entropy, openssl enc without explicit flags)

From the source SKILL.md

Decision aid for cryptographic primitive choices. Use this skill when designing or reviewing systems that encrypt, authenticate, derive, or sign — and especially before writing any line of code that calls a low-level crypto API.

What this skill does

Crypto Primitive Selection is a community-contributed Claude Code skill in the crypto-keymgmt sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/crypto-primitive-selection/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Crypto Primitive Selection Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 70,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/crypto-primitive-selection
curl -L https://claudskills.com/skills/crypto-primitive-selection/SKILL.md \
  -o ~/.claude/skills/crypto-primitive-selection/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/crypto-primitive-selection/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/crypto-primitive-selection/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\crypto-primitive-selection\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

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See pricing → Download desktop app

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
ClaudSkills. (2026). Crypto Primitive Selection [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/crypto-primitive-selection/
BibTeX
@misc{crypto-primitive-selection-2026,
  author    = {ClaudSkills},
  title     = {Crypto Primitive Selection [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/crypto-primitive-selection/}
}

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