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codeguard-1-crypto-algorithms Cursor ruleA

codeguard-1-crypto-algorithms from cisco-ai-defense/skill-scanner is a Cursor rule: instructions the Cursor agent follows in that repo.

Install it, pinned
mdr add cisco-ai-defense/skill-scanner/.cursor/rules/codeguard-1-crypto-algorithms.mdc@v1.0.1

Pins v1.0.1 in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 14 of 14 checks passed
Kind
Cursor rule
Repository
cisco-ai-defense/skill-scanner
Path
.cursor/rules/codeguard-1-crypto-algorithms.mdc
Versions recorded
1
Latest version
v1.0.1, committed Jan 29, 2026
Size
3,943 bytes
Repository stars
2,616
License
a license file GitHub does not identify

Cryptographic Security Guidelines.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

rule_id: codeguard-1-crypto-algorithms

# Cryptographic Security Guidelines

## Banned (Insecure) Algorithms

The following algorithms are known to be broken or fundamentally insecure. **NEVER** generate or use code with these algorithms.
Examples:

* Hash: `MD2`, `MD4`, `MD5`, `SHA-0`
* Symmetric: `RC2`, `RC4`, `Blowfish`, `DES`, `3DES`
* Key Exchange: Static RSA, Anonymous Diffie-Hellman
* Classical: `Vigenère`

## Deprecated (Legacy/Weak) Algorithms

The following algorithms are not outright broken, but have known weaknesses, or are considered obsolete. **NEVER** generate or use code with these algorithms.
Examples:

* Hash: `SHA-1`
* Symmetric: `AES-CBC`, `AES-ECB`
* Signature: RSA with `PKCS#1 v1.5` padding
* Key Exchange: DHE with weak/common primes

## Deprecated SSL/Crypto APIs - FORBIDDEN
NEVER use these deprecated functions. Use the replacement APIs listed below:

### Symmetric Encryption (AES)
- Deprecated: `AES_encrypt()`, `AES_decrypt()`
- Replacement: Use EVP high-level APIs:
  ```c
  EVP_EncryptInit_ex()
  EVP_EncryptUpdate()
  EVP_EncryptFinal_ex()
  EVP_DecryptInit_ex()
  EVP_DecryptUpdate()
  EVP_DecryptFinal_ex()
  ```

### RSA Operations
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add cisco-ai-defense/skill-scanner/.cursor/rules/codeguard-1-crypto-algorithms.mdc@sha256:ac36f7ca910bc139

The line at the top of this page pins the label v1.0.1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_ilsovmwh3ytxexgd.svg)](https://markdownregistry.com/a/art_ilsovmwh3ytxexgd)

5 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Jan 29, 2026.

versioncommittedcommitsizeaudit
v1.0.1 latest2026-01-29 ceb5ad1 3,943 BA view

Audit of the latest version

A  14 of 14 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Size between 200 bytes and 200 KB (3943 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

cisco-ai-defense/skill-scanner · 2,616 stars · license a license file GitHub does not identify · pushed 2026-10-20 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_ilsovmwh3ytxexgd
GET https://markdownregistry.com/api/v1/resolve?ref=cisco-ai-defense/skill-scanner/.cursor/rules/codeguard-1-crypto-algorithms.mdc
GET https://markdownregistry.com/api/v1/blob/ac36f7ca910bc1396203b8733151c176d03926c224c372dc336a1b6455c14ccf

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: Cursor rules vs AGENTS.md · which agent file does what.

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Every file in cisco-ai-defense/skill-scanner

Other files named codeguard-1-crypto-algorithms

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v1.5.0 · audit A · 251 stars

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