These parameters are more awkward than difficult to accommodate. Despite the stringency of FDA requirements, any number of electronic signature technologies may be used so long as the conditions of the rule are satisfied. These technologies range from identification codes used in conjunction with manually entered passwords to more sophisticated biometric systems. The final rule allows for the use of a wide variety of electronic record technologies - the most popular being biometric devices. Biometrics is the method of verifying an individual's identity based on measurement of physical features or repeatable actions that are unique to that individual.
Biometric devices use one or more biometric parameters to identify the individual.
They are connected, usually by direct wire or network, to the system that requires authentication and are typically placed next to the computer. Biometric devices verify identification by comparing patterns presented by the individual at the time of verification with stored patterns obtained from the authorized user under controlled circumstances. Most of these devices are easily adapted to a variety of situations. For instance, iris scanners are already being used by Japanese banks to authenticate users of automatic teller machines. When biometric devices are used for electronic signatures, the electronic signature must be designed in such a way that it cannot be used by anyone other than the genuine owner.