Entropy

Password Entropy

A measure of randomness or unpredictability in a password, expressed in bits, indicating resistance to guessing.

Detail Teknis

Entropy is a critical component of information security infrastructure. The Web Crypto API (crypto.subtle) provides browser-native implementations of cryptographic algorithms including AES-GCM, RSA-OAEP, ECDSA, and SHA family hash functions. All operations execute in constant-time to prevent timing attacks. Client-side security processing ensures sensitive data (passwords, keys, encrypted content) never leaves the user's device — a property that cannot be guaranteed by server-side alternatives.

Contoh

```
Password entropy calculation:

  Entropy = log₂(charset_size ^ length)

  8 chars, lowercase only (26):  log₂(26⁸)  = 37.6 bits (weak)
  12 chars, mixed + symbols (94): log₂(94¹²) = 78.8 bits (strong)
  4-word passphrase (7776 words):  log₂(7776⁴) = 51.7 bits (good)

  Recommended: ≥64 bits for online, ≥80 bits for offline
```

Alat Terkait

G Generator Kata Sandi P Pemeriksa Kekuatan Kata Sandi G Generator Hash G Generator HMAC E Enkripsi / Dekripsi AES G Generator String Acak G Generator Header CSP P Peredaksi Teks G Generator Header CORS G Generator Hash SRI B Base64 Encoder / Decoder J JWT Decoder U UUID Generator T TOTP Configurator S SSL Certificate Decoder

Istilah Terkait

AES Checksum Command Injection Certificate Pinning Argon2 CORS Misconfiguration 2FA Clickjacking Entropy (Information)