Last updated 23 Jun 2023
A True User Imposter Test evaluates the False Accept and False Accept rates of a Voice Biometric system by using existing users of the system to simulate imposter attempts. This is an essential step in establishing the appropriate Biometric threshold.
A True User Imposter Test is part of the Tuning and Calibration process for Voice Biometrics systems. It uses real user data to simulate imposter access attempts. For example:
- 1000 speakers with 1 enrollment utterance and 4 verification utterances provide:
- 4,995,000 imposter access attempts (1000 speakers x 999 imposters x 5 utterances ) imposter attempts and
- 4000 genuine access attempts (1000 speakers x 4 utterances).
As each trial generates a biometric score, they can be graphically plotted to help understand the performance of the system.
Based on the results of the True User Imposter Test, it is possible to calibrate the biometric decision threshold such that the risk of a False Accept (FA) is consistent with the implementing organisation’s risk appetite.
Related Terms
Popular Posts
4 mins read
Nearly all implementations of voice biometrics are driven by promises to make it easier for customers to gain account access, reduce the time spent by front-line agents in authenticating customers, and making sure customers’ personal data and services are secure.
9 mins read
Advances in Speaker Recognition technology and increasing acceptance of conversational interfaces are allowing organisations to authenticate callers using the short utterances now obtained in natural language and speech driven self service applications, without the overhead of traditional active enrolment processes.
4 mins read
Our Call Centre Security Experience Scorecard gives you the benefit of our 10 years of experience in just 10 minutes. It helps organisations understand how to improve the usability, efficiency and security of their experience.