摘要: 基于模糊穹的特征保护方法存在敌手冒充和空间自由度减少的问题。为此,提出一种基于伪矩阵(Chaff Matrix)的可撤销声纹模板设计方法。通过原始特征矢量的构成元素产生伪点,根据定位矩阵将伪点插入原始特征,且在欧氏距离准则下,插入前后特征矢量与模板之间距离的变化量相同,从而保证系统识别率,实现特征保护。实验结果验证了该方法的正确性。
关键词:
声纹认证,
可撤销模板,
模糊穹,
生物加密,
超球体,
梅尔倒谱系数
Abstract: Aiming at the problems of fake and decrease of interspaces in Fuzzy Vault(FV) method, this paper proposes a voiceprint template protection method based on Chaff Matrix(CM). The CM is generated from raw feature and interweaved with raw template according to Orientation Matrix(OM), such that a cancelable template is designed to protect the voiceprint. Problems of fake and decrease of interspaces for Chaff Points(CPs) in FV are solved by the mixture on a thinner layer. Mathematical analysis explained the proposal doesn’t deteriorate the performance, for the invariability of the distance change between features. Experimental results show the validity of this method.
Key words:
voiceprint authentication,
cancelable template,
Fuzzy Vault(FV),
biometric encryption,
hypersphere,
Mel Frequency Cepstral Coefficient(MFCC)
中图分类号:
徐文华, 易法令, 熊伟. 基于Chaff Matrix的可撤销声纹模板设计[J]. 计算机工程, 2012, 38(04): 236-238.
XU Wen-Hua, YI Fa-Lian, XIONG Wei. Design of Cancelable Voiceprint Template Based on Chaff Matrix[J]. Computer Engineering, 2012, 38(04): 236-238.