Segment-based speaker verification using dynamically generated phrases

A system comprising:

• one or more computers;
• and
• one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising:
• receiving a request for a verification phrase for verifying an identity of a user;
• in response to receiving the request for the verification phrase for verifying the identity of the user, identifying subwords to be included in the verification phrase;
• in response to identifying the subwords to be included in the verification phrase, obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase, based on a predetermined criteria, and
• providing the verification phrase as a response to the request for the verification phrase for verifying the identity of the user,
• wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which no stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase.

A non-transitory computer-readable storage medium storing software comprising instructions executable by one or more computers which, upon such execution, cause the one or more computers to perform operations comprising:

• receiving a request for a verification phrase for verifying an identity of a user;
• in response to receiving the request for the verification phrase for verifying the identity of the user, identifying subwords to be included in the verification phrase;
• in response to identifying the subwords to be included in the verification phrase, obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase, based on a predetermined criteria;
• and
• providing the verification phrase as a response to the request for the verification phrase for verifying the identity of the user,
• wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which no stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase.