Biometric systems may be initially adequately secure, but become less so with passing time. This could be because critical security parameters such as threshold settings become maladjusted, or sloppy enrolment procedures lead to poor enrolment quality. Some biometric systems are self-adaptive which means that the templates are updated each time a user accesses the ...

The performance of biometric systems is dependent on the quality of the enrolled biometric. Enrolment quality can be affected by accidental or deliberate events and environmental conditions, and the result of low enrolment quality is almost inevitably poor system performance. If the performance is poor the security will be compromised, and there may be ...