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Crypto · Password Security

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Choose by what you need to protect

A password hash, reversible encryption and a time-based code solve different problems. Start with the operation your application needs; a successful conversion alone does not establish secure account handling.

Store a password verifier

Generate or compare a bcrypt hash. Login systems compare a candidate password with the stored hash; they do not decrypt it.

Recover encrypted content later

Use reversible encryption when the recipient must recover the original text. Key storage and the encryption format still need an application-level design.

Reproduce an authenticator code

Compare the same Base32 secret, SHA1 algorithm, number of digits, period and clock. A matching local code does not enroll an account.

Check a known TOTP answer before debugging a login

RFC 6238 test secret (ASCII): 12345678901234567890
SHA1 · 8 digits · 30-second step
Unix time 59 → 94287082

This is a fixed-time reference vector. The generator uses your current device time, so its live code will normally differ. When two live authenticators disagree, compare secret bytes and settings before blaming the password hash.

Use disposable examples. Password strength estimates and hash identification do not verify that an account exists, that a password has never leaked, or that a server correctly limits login attempts.