Thursday, 1 May 2008

False Rejection Rate (FRR)

The False Rejection Rate (FRR) is the technical designation for the level of statistical Type I errors associated with a biometric product. False rejection rates are the level at which valid users are incorrectly rejected by the system when they should've been allowed access.

Although the False Accept Rate is generally considered more critical (Type II error) as this determines the number of unauthorized accesses that are validated and granted access to the system without authority, the false rejection rate may create undue frustration (1) and indeed operational efficiency if the rate is too high.

FRR may be increased through smudged lenses, improper alignment of the reading system or through items which obscure the subject’s features[1]. In many instances, uncooperative users will either overtly or covertly compromise, damage or sabotage the effectiveness of the system (1). As some people believe that biometric systems are a breach of their personal privacy, providing an incentive for them to use the system may be difficult. These uncooperative uses will often engage in small acts of sabotage to lower the effectiveness and efficiency of the system which may result in its removal.

[1] http://www.ccert.edu.cn/education/cissp/hism/039-041.html

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