1. A computer-implemented process for verifying the identity of a speaker, comprising: using a computing device for: asking a speaker to repeat a pass phrase; adapting a trained speaker-independent model to create a speaker-specific model without requiring retraining of the trained speaker-independent model to be used in verifying that the pass phrase is spoken by a specific speaker using a Maximum Likelihood Linear Regression procedure in a text-dependent manner; inputting a speech signal containing a pass phrase as spoken by a user who claims to be a specific speaker, wherein the speaker was not asked to repeat the pass phrase; extracting features from the speech signal; inputting the features and the speaker-independent model into a speech recognizer and outputting a first recognizer score; inputting the features and the speaker-specific model into a speech recognizer and outputting a second recognizer score; and using the first and second recognizer scores to determine if the pass phrase is spoken by the specific speaker.