1. A spoken password verification apparatus comprising: first means for storing a first speech model of a first entry of a password spoken by a user; second means for storing a plurality of reference voice (RV) speech models based on speech inputs by persons, each RV speech model including said password; means for selecting at least one RV speech model based on a predetermined difference of similarity between said first speech model and said at least one RV speech model, said means for selecting further comprising means for ranking said RV speech models based on said difference of similarity, and wherein said means for selecting selects said at least one RV speech model based on a predetermined threshold from a range of said RV speech model rankings of 15-50 percentile, where a 100 percentile ranking represents a highest ranked RV speech model most similar to said first speech model; third means for storing a second speech model of a second entry of said password spoken by said user; means for comparing said second speech model and said selected at least one RV model to determine a measure of similarity; means for determining validity of said second entry of the password based on said measure of similarity.
1. A spoken password verification apparatus comprising: first means for storing a first speech model of a first entry of a password spoken by a user; second means for storing a plurality of reference voice (RV) speech models based on speech inputs by persons, each RV speech model including said password; means for selecting at least one RV speech model based on a predetermined difference of similarity between said first speech model and said at least one RV speech model, said means for selecting further comprising means for ranking said RV speech models based on said difference of similarity, and wherein said means for selecting selects said at least one RV speech model based on a predetermined threshold from a range of said RV speech model rankings of 15-50 percentile, where a 100 percentile ranking represents a highest ranked RV speech model most similar to said first speech model; third means for storing a second speech model of a second entry of said password spoken by said user; means for comparing said second speech model and said selected at least one RV model to determine a measure of similarity; means for determining validity of said second entry of the password based on said measure of similarity. 3. The spoken password verification apparatus of claim 1 wherein said range of said RV speech model rankings consists of 20-40 percentile.