Zero-knowledge multiparty secure sharing of voiceprints

A computer implemented method comprising:

• receiving, by a first computer from a third party server, an encrypted voiceprint model generated at a second computer and an encrypted random number encrypted using a public key of the first computer;
• decrypting, by the first computer, the random number using a private key of the first computer;
• extracting, by the first computer, a plaintext voiceprint from an audio;
• generating, by the first computer, one or more encrypted comparison models based upon the encrypted voiceprint model generated at the second computer, the plaintext voiceprint generated at the first computer, and the random number;
• transmitting, by the first computer, the one or more encrypted comparison models to the third party server;
• receiving, by the first computer from the third party server, a similarity score between the encrypted voiceprint model and the plaintext voiceprint;
• and
• identifying, by the first computer, a speaker of a voice in the audio based on the similarity score or a fraudulent caller.

A system comprising:

• a non-transitory storage medium configured to store a plurality of encrypted voiceprint models and a lookup table for encrypted similarity scores and corresponding plaintext similarity scores;
• a processor coupled to the non-transitory storage medium and configured to:
• receive from a first client computer, an encrypted voiceprint model and an encrypted random number, wherein the random number is encrypted using a public key of the computer;
• decrypt the random number using a private key of the computer;
• transmit the encrypted voiceprint model to a second client computer;
• receive one or more encrypted comparison models generated by the second computer based upon comparing the encrypted voiceprint model generated at the first client computer and a plaintext voiceprint generated at the second client computer;
• determine an encrypted similarity score between the encrypted voiceprint model generated at the first client computer and the plaintext voiceprint generated at the second client computer using the random number on the one or more encrypted comparison models;
• and
• retrieve from the lookup table in the non-transitory storage medium a plaintext similarity score corresponding to the encrypted similarity score.