International Journal of Electrical, Electronics and Computer Engineering (IJEECE)
Authentication is any protocol or process that permits one entity to establish the identity of another entity. It relies on three factors: something a user knows, such as a password or PIN, something a user has, such as a key, a card, or another kind of token and something a user is, such as a retina scan, or fingerprint. The authors can increase the reliability and security of the authentication mechanism by combining multiple authentication factors into a single model. The two factors together provide a much higher confidence in the authentication. This paper reviews various two-factor authentication schemes.