Voice biometric systems can be defeated by "wolves"
The founder of Australian voice biometrics outfit Armorvox, Dr. Clive Summerfield, claims that between 10% and 20% of utterances collected by voice biometric systems are not strong enough identifiers on the individual that spoke them.
Most voice biometric implementations require users to utter a phrase as part of the authentication process. However, a small fraction of the population Dr Summerfield labels as “wolves”, have voice prints that can match many others, while "goats" are those with generic voice prints.
A "less effective" voice print can be caused by ambient noise or signal clipping when the original signal was collected. Dr. Summerfiled also believes that certain voice biometric systems build in tolerances for these less distinct voice prints, therefore applying a lower authentication standard when processing them.
