Password Generator

This tool uses the Web Crypto API's `crypto.getRandomValues()` to generate cryptographically secure random numbers, which are far superior to `Math.random()` for security purposes. The algorithm builds a character pool based on your selections (uppercase A-Z, lowercase a-z, digits 0-9, special symbols), then picks characters uniformly at random from that pool for each position in the password.

Password strength is measured in bits of entropy, calculated as: entropy = length x log2(pool size). For example, a 16-character password drawn from a pool of 94 characters (all printable ASCII) yields approximately 104.8 bits of entropy. NIST guidelines recommend a minimum of 80 bits for high-security applications. The tool also checks against common patterns — sequential characters, repeated characters, and dictionary words — to ensure the generated password resists both brute-force and dictionary attacks.