cryptography
Cryptanalysis techniques — lattice attacks, padding oracles, weak-RNG exploitation, signature forgery, secret-sharing recovery.
- Installs
- 148
- Last 24h
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/transilienceai/communitytools --skill cryptography- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads cryptography automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Cryptography
Scope
Practical cryptanalysis for CTF and pentest engagements: identifying when a cryptographic primitive's structure (custom hash, partial leaks, related primes, bad RNG, weak modes) admits a faster-than-brute-force solver, then implementing that solver in pure Python where possible. Covers RSA-style algebraic factoring, lattice/AGCD recovery, GF(2) linear collapse of "complicated-looking" custom ciphers, smooth-order DLP, differential fault attacks, and Shamir-style secret-sharing recovery over non-prime moduli. Always read source first to detect linearity/algebraic structure before reaching for SageMath or symbolic solvers.
When to use
- A challenge or target ships custom crypto (custom hash, custom block cipher, hand-rolled key derivation) and you need to look for affine / GF(2)-linear collapse.
- RSA-style primitives with structured primes (
p = a·r + b,phi(n)perfect square, multi-prime hint files, common factors). - A service exposes a chosen-ciphertext / chosen-input oracle and you suspect padding-oracle, smooth-order DLP, or Bleichenbacher-style recovery.
- AES with fault injection (correct + faulty ciphertext for the same key — Piret-Quisquater DFA).
- Shamir secret sharing or threshold schemes with non-prime moduli (2-adic recovery via Lagrange interpolation with valuation tracking).
References
- reference/lattice-attacks.md — AGCD lattice, discriminant-square factoring, smooth-order DLP, Piret-Quisquater DFA.
- reference/linear-secret-recovery.md — GF(2) affine collapse of custom hashes/ciphers via column-by-column linear recovery.
FAQ
What does the cryptography skill do?
Cryptanalysis techniques — lattice attacks, padding oracles, weak-RNG exploitation, signature forgery, secret-sharing recovery.
How do I install cryptography?
Run npx skills add https://github.com/transilienceai/communitytools --skill cryptography in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/cryptography/ (personal) or .claude/skills/cryptography/ (project).
Which AI agents can use cryptography?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is cryptography safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains cryptography?
It is published by transilienceai in transilienceai/communitytools. It has 148 recorded installs.
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