Secure Password Generator
Generate cryptographically secure passwords and passphrases using Web Crypto API (CSPRNG). Customize length, character types, entropy, and batch generate up to 50 passwords at once.
Cryptographically Secure Password & Passphrase Generator
Generate high-entropy passwords using Web Crypto API CSPRNG algorithms.
Strong, unique passwords are the foundational defense against credential stuffing, dictionary attacks, and rainbow table cracking. Our generator uses cryptographically secure pseudorandom number generators (CSPRNG) via the native browser Web Crypto API.
How It Works & Underlying Architecture
Instead of predictable pseudorandom math like Math.random(), our generator invokes window.crypto.getRandomValues(). This samples operating system hardware entropy pools to generate truly unpredictable random bytes, mapped to uppercase letters, lowercase letters, digits, and special symbols, complete with real-time Shannon entropy calculation in bits.
Technical Specifications & Standards
| Engine | Web Crypto API (window.crypto.getRandomValues) |
| Entropy Standard | NIST SP 800-63B Guidelines |
| Features | Custom Length (8-128 chars), Entropy Meter, Batch Mode (up to 50 passwords) |
Real-World Engineering & Creative Use Cases
- Sysadmin Credential Provisioning: Creating strong root, SSH, and database service passwords.
- Personal Cybersecurity: Generating unique credentials for password managers like Bitwarden or 1Password.
- API Secret Generation: Creating 32-byte and 64-byte random keys for HMAC secrets and webhook tokens.
Frequently Asked Questions (FAQ)
Why is Math.random() insecure for generating passwords?
Math.random() uses pseudorandom algorithms like XorShift, whose internal state can be reconstructed by an attacker after observing a few outputs. Web Crypto API uses OS entropy pools and is cryptographically secure.
How many bits of entropy are considered secure?
According to modern security standards, passwords with 80+ bits of entropy are practically immune to online brute-force, while 128 bits protects against nation-state offline attacks.