What is a one-time passphrase used for?

A one-time passphrase is specifically designed to enhance security by preventing replay attacks. Replay attacks occur when an attacker captures a valid authentication message and later reuses it to gain unauthorized access to a system. By utilizing a one-time passphrase, which is only valid for a single session or transaction, an organization ensures that even if an attacker intercepts the passphrase, it cannot be reused. This significantly mitigates the risk associated with these types of attacks, as the passphrase is essentially rendered useless after its initial use.

The other options do not appropriately describe the function of a one-time passphrase. Authenticating through biometrics involves the use of physical characteristics, like fingerprints or facial recognition, rather than a passphrase. Storing encrypted passwords pertains to how passwords are kept secure, not how they are verified for authentication. Securing a permanent password contradicts the essence of a one-time passphrase, which is inherently temporary by design.