Generate Encryption Key Password

A password is human-chosen or generated text that a user enters for authentication. An encryption key is derived from that password (using a key derivation function like PBKDF2 or Argon2) or generated directly as random bytes. The key is what the encryption algorithm actually uses. A weak password produces a weak key, which is why random generation matters.

AES-256 uses a 256-bit (32-byte) key and is recommended for the most sensitive data, though AES-128 remains unbroken and is sufficient for most purposes. Our 32-character mixed generator produces enough entropy for AES-256. For AES-128, 16 characters of random mixed-type characters provides adequate key material when processed through a proper key derivation function.

Store backup copies in physically separate secure locations: a bank safety deposit box, a fireproof home safe, or split the key using Shamir's Secret Sharing so no single backup location holds the complete key. Never store encryption key backups digitally alongside the encrypted data they protect, as that defeats the purpose entirely.

Using the same key for multiple encryptions is acceptable if each encryption uses a unique initialization vector (IV) or nonce, which modern encryption libraries handle automatically. However, for maximum security, use separate keys for separate datasets. If one key is compromised, only the data encrypted with that specific key is exposed.