关键词: 声纹, 同态加密, 模板保护, 身份认证

Abstract: A voiceprint template protection method based on homomorphic encryption scheme is proposed, which takes the characteristics of speech features and Vector Quantization（VQ） speaker recognition algorithms into account. Voiceprint features and codewords are transformed into non-negative integers. Components of Euclidean distance are calculated in the ciphertext domain by improved homomorphic encryption algorithm in the range of the integer. Decision is made according to the average minimum quantization error which is calculated with decrypting homomorphically component addition of VQ distance. The ciphers don’t leak the decimal fraction and sign information of plain text and can resist known plaintext attacks. The experimental results demonstrate the proposed method can keep the performance of authentication system as the same as in the original feature domain.

Key words: voiceprint, homomorphic encryption scheme, template protection, authentication