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Direct answer
UseCOS generates high-entropy random passwords and multi-word passphrases using your device's native Web Cryptography API (crypto.getRandomValues). Entropy is calculated in bits using Shannon information theory. Generated secrets are created locally in your browser memory and are never transmitted over the internet or saved to disk.
Generate unbreakable cryptographic passwords, memorable passphrases, and PINs. 100% offline-ready inside your device memory with zero server transmission.
Password strength is measured in bits of entropy (\(E = L \times \log_2(N)\)), where \(L\) is password length and \(N\) is the pool size of possible characters. A password with 80+ bits of entropy would take modern GPU superclusters millions of years to brute force.
| Entropy Range | Rating | Estimated Brute Force Time (100 Billion Guesses/sec) |
|---|---|---|
| < 40 bits | Very Weak | Few milliseconds to minutes |
| 40 – 64 bits | Moderate | Few hours to several days |
| 65 – 80 bits | Strong | Centuries to millennia |
| 80+ bits | Cryptographically Secure | Trillions of years (Uncrackable) |
Modern NIST (National Institute of Standards and Technology) guidelines favor multi-word passphrases (e.g., correct-horse-battery-staple) over short, cryptic strings with symbols. A 5-word Diceware passphrase drawn from an EFF wordlist provides ~65 bits of entropy while remaining easy to type on mobile keyboards.
Never reuse passwords across different online services. Always enable Hardware Security Keys (FIDO2 / WebAuthn) or Authenticator App Two-Factor Authentication (TOTP) on banking, email, and primary login accounts.
Generates numbers using OS-level cryptographic entropy collectors (hardware timing, CPU jitter, mouse motion) rather than insecure Math.random().
Authored by UseCOS Research & Engineering.