Voice authentication system and methods

A method in accordance with any one of the preceding claims, comprising the further step of determining an individual false rejection rate for the enrolled sample, the individual false rejection rate being additionally utilised to derive the measure of confidence.

A method in accordance with any one of the preceding claims, wherein the impostor samples have the same content type and/or speaker characteristic as the enrolled sample.

A voice authentication system comprising:

• an ascertaining module operable to ascertain a measure of confidence associated with a voice sample enrolled with the authentication system, the measure of confidence being derived through simulated impostor testing carried out on the enrolled sample by an impostor testing module.

A method for providing a secure service, comprising the steps of:

• receiving data indicative of a measure of confidence associated with a user of the secure service, the measure of confidence being derived through simulated impostor testing carried out on an voice sample of the user;
• and
• adjusting a level of authentication required by the user to access the secure service based, at least in part, on the measure of confidence.

A secure service provider system comprising:

• a receiving module operable to receive data indicative of a measure of confidence associated with a user of the secure service, the measure of confidence being derived through simulated impostor testing carried out on a voice sample of the user;
• and
• an adjustment module operable to adjust a level of authentication required by the user to access the secure service based, at least in part, on the measure of confidence.