Which error type in biometric systems is represented by the movement from legitimate access to unauthorized access?

The movement from legitimate access to unauthorized access in biometric systems is referred to as a Type 2 Error, often known as a false rejection. In this context, a Type 2 Error occurs when an authorized user is incorrectly identified as being unauthorized, causing them to be denied access to a system.

This type of error is critical in the context of biometric systems since it can lead to legitimate users being unable to access resources they have rights to, potentially hindering their ability to perform necessary tasks. In high-security environments, such errors can hinder productivity and may prompt users to seek alternative authentication methods, undermining the reliability of the biometric system.

Conversely, a Type 1 Error, or a false acceptance, occurs when an unauthorized user is incorrectly identified as legitimate, which poses a different risk. Understanding these error types is essential for managing and optimizing biometric systems, as it helps in measuring and balancing the trade-offs between security and user accessibility.