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This technology is not as mundane as it sounds. The concept is based on a password or PIN system but adds the extra dimension of keystroke dynamics. With this technology, not only must intruders know the correct password, but they must also be able to replicate the user s rate of typing and intervals between letters. Even if an unauthorized person is able to guess the correct password, it s unlikely that he will be able to type it with the proper rhythm unless he has the ability to hear and memorize the correct user s keystrokes. Keystroke recognition is most likely one of the least secure of the new biometric technologies that have evolved in recent years, but it is also probably one of the least expensive and easiest to implement. It probably won t gain much attention for use in electronic commerce because similarly priced systems offer far more reliability.
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When you re choosing a biometric authentication system, an important consideration is its accuracy. The accuracy of biometric authentication systems can be categorized by two measures: the false acceptance rate (FAR) and the false rejection rate (FRR). A system s FAR reflects the situation in which a biometric system wrongly verifies an identity by matching biometric features from individuals who are not identical. In the most common context, false acceptance represents a security hazard. Similarly, a system s FRR reflects the situation in which a biometric system is not able to verify the legitimate claimed identity of an enrolled person. In the most common context, the user of a biometric system will experience false rejection as inconvenience. Suppliers of biometric systems often use FAR together with FRR to describe the capabilities of the system. Obviously, FRR and FAR are dependent on the threshold level. Increasing the threshold will reduce the probability of false acceptance and therefore enhance security. However, system availability will be reduced due to an increased FRR. How these rates are determined is fundamental to the operation of any biometric system and therefore should be considered a primary factor
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when a biometric system is evaluated. You should be aware that manufacturers FAR and FRR numbers are extrapolated from small user sets, and the assumptions for the extrapolations are sometimes erroneous. You should assess these performance factors with an eye toward the type of users who will use the system. For a proper live scan to be taken, users must become familiar with the device. You can expect it to take two weeks before the false rejection rate drops off. Another user consideration is that not all users may be able to use the biometric for example, because of an impairment that prevents them from taking an acceptable scan. In that case, you may need to provide an alternative method to grant those users access, or you may have to select a biometric based on the needs of each set of users. When selecting a biometric, also consider user acceptance. Some biometrics have met with resistance from users because the technology is too invasive.
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Passwords, authentication tokens, and biometrics are subject to a variety of attacks. Passwords can be guessed, tokens can be stolen, and even biometrics have certain vulnerabilities; these threats can be reduced by applying sound design principles and system management techniques during the development and operation of your authentication system. One method that can substantially increase the system s security is to use a combination of authentication techniques. For example, an authentication system might require users to present an authentication token and also enter a password. By stealing a user s token, an attacker would still not be able to gain access to the host system because the system would require the user s password in addition to the token. Although it might be possible to guess the user s password, the host system can make this extremely difficult by locking the user out after a specified number of invalid passwords have been presented in succession. After a user s account has been locked in this manner, only the appropriate system administrator or security officer should be able to unlock the account. Tokens can also be used to store biometric templates for user authentication. After enrollment, the user s unique template could be stored on a token rather than in a file on the host system. When the user requests access to the system, a current template is generated and compared to the
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