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*[[Biometrics]] authentication is the measuring of a user’s physiological or behavioral features to attempt to confirm his/her identity. Physiological aspects that are used include fingerprints, eye retinas and irises, voice patterns, facial patterns, and hand measurements. Behavioral aspects that are used include signature recognition, gait recognition, speaker recognition and typing pattern recognition. When a user registers with the system which he/she will attempt to access later, one or more of his/her physiological characteristics are obtained and processed by a numerical algorithm. This number is then entered into a database, and the features of the user attempting to match the stored features must match up to a certain error rate.
===Token
Token Authentication comprises [[security token]]s which are small devices that authorized users of computer systems or networks carry to assist in identifying that who is logging into a computer or network system is actually authorized. They can also store cryptographic keys and biometric data. The most popular type of security token ([[RSA SecurID]]) displays a number which changes every minute. Users are authenticated by entering a [[personal identification number]] and the number on the token. The token contains a time of day clock and a unique seed value, and the number displayed is a cryptographic hash of the seed value and the time of day. The computer which is being accessed also contains the same algorithm and is able to match the number by matching the user’s seed and time of day. Clock error is taken into account, and values a few minutes off are sometimes accepted. Another similar type of token (Cryptogram) can produce a value each time a button is pressed. Other security tokens can connect directly to the computer through [[Universal Serial Bus|USB]], [[Smart card]] or [[Bluetooth]] ports, or through special purpose interfaces. Cell phones and [[Personal digital assistant|PDA]]'s can also be used as security tokens with proper programming.
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