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Ctf Crypto

Checked
cyberkaida·vlatest·security·Apache-2.0

This CTF Crypto skill provides tools & challenges for practicing cryptography techniques in a competitive setting, boosting your security skills.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add cyberkaida/reverse-engineering-assistant --skill ctf-crypto -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

cyberkaida

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned cyberkaida/reverse-engineering-assistant at f603ba9833.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
f603ba9833
Manifest
ReVa/skills/ctf-crypto/SKILL.md
Scanned
2 files, 883 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

ctf-crypto

What it does

This skill equips AI agents to solve cryptographic challenges within Capture The Flag (CTF) competitions. It enables the agent to analyze encrypted data, identify cipher types, and apply appropriate decryption techniques to recover hidden flags.

When to use it

  • You need assistance breaking classical ciphers like Caesar, Vigenère, or substitution ciphers found in CTF write-ups.
  • Your agent is stuck on a challenge requiring frequency analysis or pattern recognition in encrypted text.
  • You want the AI to automate the process of testing common encryption algorithms against provided ciphertexts.

Key capabilities

  • Identifies and decodes various classical cryptographic ciphers.
  • Performs frequency analysis to crack substitution-based encryptions.
  • Extracts hidden flags from encrypted strings commonly used in CTF scenarios.

Example prompts

  • "Analyze this ciphertext: 'Uif hooj gbsnf...' and determine the encryption method used."
  • "Help me solve a Caesar cipher challenge where the shift amount is unknown."
  • "Decrypt this string using frequency analysis techniques suitable for CTF competitions."

Tips & gotchas

Ensure you provide sufficient context or sample ciphertext, as classical ciphers often require specific input patterns to be solved accurately. This skill focuses on classical cryptography and may not handle modern asymmetric encryption without additional tools.