About

Imported from henriquescastilho/my-claude (.claude/skills/performing-cryptographic-audit-of-application/SKILL.md). Install upstream with npx skills add henriquescastilho/my-claude --skill performing-cryptographic-audit-of-application. Copyright stays with the author (Apache-2.0).

Performing Cryptographic Audit of Application

Name: performing-cryptographic-audit-of-application
Author: henriquescastilho

Overview

A cryptographic audit systematically reviews an application's use of cryptographic primitives, protocols, and key management to identify vulnerabilities such as weak algorithms, insecure modes, hardcoded keys, insufficient entropy, and protocol misconfigurations. This skill covers building an automated crypto audit tool that scans Python and configuration files for common cryptographic weaknesses.

When to Use

When conducting security assessments that involve performing cryptographic audit of application
When following incident response procedures for related security events
When performing scheduled security testing or auditing activities
When validating security controls through hands-on testing

Prerequisites

Familiarity with cryptography concepts and tools
Access to a test or lab environment for safe execution
Python 3.8+ with required dependencies installed
Appropriate authorization for any testing activities

Objectives

Detect usage of deprecated algorithms (MD5, SHA-1, DES, RC4)
Identify insecure cipher modes (ECB) and padding schemes
Find hardcoded keys, passwords, and secrets in source code
Verify TLS/SSL configuration strength
Check key derivation function parameters
Validate random number generator usage
Produce a structured audit report with findings and remediation

Key Concepts

Cryptographic Weakness Categories

Category	Examples	Risk Level
Weak Hashing	MD5, SHA-1 for integrity/signatures	High
Insecure Encryption	DES, 3DES, RC4, Blowfish	High
Bad Cipher Mode	ECB mode for any block cipher	High
Insufficient Key Size	RSA < 2048, AES-128 for long-term	Medium
Hardcoded Secrets	Keys/passwords in source code	Critical
Weak KDF	Low iteration PBKDF2, plain MD5	High
Poor Entropy	time-based seeds, predictable IVs	High
Deprecated Protocols	SSLv3, TLS 1.0, TLS 1.1	High

Security Considerations

Review both application code and configuration files
Check third-party dependencies for known crypto vulnerabilities
Verify certificates and TLS configurations on deployed servers
Ensure secrets are loaded from environment variables or vaults
Review key storage and rotation practices

Validation Criteria

Scanner detects all injected test weaknesses
MD5/SHA-1 usage for security purposes is flagged
ECB mode usage is flagged
Hardcoded keys/passwords are detected
Weak KDF parameters are identified
Report includes severity, location, and remediation
False positive rate is below 10%

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/henriquescastilho-my-claude-performing-cryptographic-aud-91706e/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

henriquescastilho-my-claude-performing-cryptographic-aud-91706e.ocm.jsonjson

{
  "ocm": "1",
  "id": "henriquescastilho-my-claude-performing-cryptographic-aud-91706e",
  "kind": "skill",
  "name": "performing-cryptographic-audit-of-application",
  "description": "A cryptographic audit systematically reviews an application's use of cryptographic primitives, protocols, and key management to identify vulnerabilities such as weak algorithms, insecure modes, hardco",
  "publisher": "henriquescastilho",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "skill-md",
      "cryptography",
      "audit",
      "security-review",
      "compliance",
      "vulnerability-assessment",
      "github"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "A cryptographic audit systematically reviews an application's use of cryptographic primitives, protocols, and key management to identify vulnerabilities such as weak algorithms, insecure modes, hardco"
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "github",
      "repository": "https://github.com/henriquescastilho/my-claude",
      "path": ".claude/skills/performing-cryptographic-audit-of-application/SKILL.md",
      "ref": "7925716f065257435fdb12e97f7e52842147d5ad",
      "url": "https://github.com/henriquescastilho/my-claude/blob/7925716f065257435fdb12e97f7e52842147d5ad/.claude/skills/performing-cryptographic-audit-of-application/SKILL.md",
      "key": "henriquescastilho/my-claude/.claude/skills/performing-cryptographic-audit-of-application/SKILL.md"
    },
    "license": "Apache-2.0"
  },
  "instructions": "# Performing Cryptographic Audit of Application\n\n## Overview\n\nA cryptographic audit systematically reviews an application's use of cryptographic primitives, protocols, and key management to identify vulnerabilities such as weak algorithms, insecure modes, hardcoded keys, insufficient entropy, and protocol misconfigurations. This skill covers building an automated crypto audit tool that scans Python and configuration files for common cryptographic weaknesses.\n\n\n## When to Use\n\n- When conducting security assessments that involve performing cryptographic audit of application\n- When following inci",
  "cost": {
    "context_tokens": 672
  }
}

Fetch it by URL: GET /api/v1/registry/henriquescastilho-my-claude-performing-cryptographic-aud-91706e/manifest?version=1.0.0

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