This disclosure describes use of challenge keywords for use in voice authentication systems. Verification keywords are generated for a particular user and serve to verify the authenticity of the user. With user permission, keyword generation is performed based on analysis of previous voice-based interactions of the user. A uniqueness score is assigned to words uttered previously by the user in interactions with the voice interface. The uniqueness score for a word is determined based on a rarity of usage of the word in the user’s speech and a distinctiveness of user pronunciation of the word.
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Chen, Shuyang and Felker, Nicholas, "Challenge keyword generation for voice-based authentication", Technical Disclosure Commons, (January 18, 2019)