{
  "ruleId": "S010",
  "name": "Must use cryptographically secure random number generators (CSPRNG)",
  "description": "Detect usage of insecure random number generators for security purposes",
  "category": "security",
  "severity": "error",
  "languages": ["JavaScript", "TypeScript", "Node.js"],
  "tags": ["security", "owasp", "cryptographic-failures", "random", "csprng"],
  "enabled": true,
  "fixable": false,
  "engine": "heuristic",
  "metadata": {
    "owaspCategory": "A02:2021 - Cryptographic Failures",
    "cweId": "CWE-338",
    "description": "Using insecure random number generators like Math.random() for security purposes can lead to predictable values that attackers can exploit. Cryptographically secure random number generators (CSPRNG) must be used for security-sensitive operations.",
    "impact": "High - Predictable tokens, weak encryption keys, authentication bypass",
    "likelihood": "Medium",
    "remediation": "Use crypto.randomBytes(), crypto.randomInt(), crypto.randomUUID(), or other CSPRNG functions for security purposes"
  },
  "patterns": {
    "vulnerable": [
      "Using Math.random() for generating security tokens",
      "Using Date.now() or timestamps for random generation",
      "Using performance.now() for security purposes",
      "Using simple increment patterns for sensitive IDs"
    ],
    "secure": [
      "Using crypto.randomBytes() for random data",
      "Using crypto.randomUUID() for unique identifiers",
      "Using crypto.randomInt() for random integers",
      "Using nanoid() for URL-safe IDs"
    ]
  },
  "examples": {
    "violations": [
      "const token = Math.random().toString(36).substring(2);",
      "const sessionId = Date.now().toString();",
      "const apiKey = Math.floor(Math.random() * 1000000);",
      "const nonce = performance.now().toString();"
    ],
    "fixes": [
      "const token = crypto.randomUUID();",
      "const sessionId = crypto.randomBytes(16).toString('hex');",
      "const apiKey = crypto.randomInt(100000, 999999);",
      "const nonce = crypto.randomBytes(8).toString('hex');"
    ]
  }
}