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Biometrics vs passwords: fingerprint and face unlock are convenience, not security

Biometric authentication (fingerprint, Face ID, iris scan) is a convenience layer, not a security improvement over a strong password. Biometrics are usernames, not passwords: they identify you but shouldn't authenticate you alone. Your fingerprint is public (you leave it on everything you touch), irrevocable (you can't change it after a breach), and legally weaker than a password in many jurisdictions.

Security domain
Fundamentals
How passwords and hashing work
Topic focus
Biometrics vs passwords
biometrics

How this is calculated

In the US, police can compel you to unlock a device with your fingerprint or face under current case law (the Fifth Amendment protects passwords as testimony but biometrics as physical evidence, similar to a blood sample or DNA swab). In the UK, Australia, and several other countries, similar legal frameworks apply. A strong alphanumeric password is protected by the right against self-incrimination in more jurisdictions. Biometrics are great for convenience (quickly unlocking your phone 50 times a day) but should be backed by a strong password or passcode as the fallback. Apple and Android both require the passcode after a restart and periodically during use, which is the correct design.

Verdict

Use biometrics for daily convenience. Use a strong alphanumeric password or passphrase as the primary authenticator. Don't rely on biometrics alone for anything you'd be upset about an attacker or law enforcement accessing.

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Password reuse risks
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Frequently asked questions

How long should a secure password be?
16 characters or more, drawn from uppercase, lowercase, numbers, and symbols. A 16-character mixed password is currently impractical to brute-force with commodity hardware, while 8-character ones can be cracked in hours by modern GPUs.
Is the generated password actually random?
Yes. The generator uses the browser's crypto.getRandomValues(), a cryptographically secure random source backed by OS entropy. The output is suitable for production password managers, API keys, and seed phrases.
Is my password saved anywhere?
No. The entire generator runs in your browser, with no network requests, no logging, and nothing stored. Close the tab and the password is gone from memory. Check your browser's Network tab to verify there are no outbound calls when a new password is generated.
What's the difference between a passphrase and a password?
A passphrase is a string of dictionary words (like "correct-horse-battery-staple"), long but memorable. A password is usually shorter with mixed character classes (like "Kx9$mQ2!pR"). Passphrases are typically stronger per character of memory effort, and this tool generates both styles.
Should I use the same password everywhere?
Never. Use a password manager (Bitwarden, 1Password, Apple Passwords) and generate a unique strong password for every site. Password reuse is the single biggest cause of account takeover. One breached service leaks the credential, and every other account using it is automatically compromised.
How often should I change my passwords?
Modern guidance (NIST SP 800-63B) says don't rotate strong unique passwords on a schedule. Only change them if you suspect compromise. Forced rotation encourages weak, incremented passwords. Strong password + password manager + 2FA is safer than any rotation policy.

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