75 Protect Voiceprint Template Based on Chaff Matrix

This paper proposed a voiceprint template protection method based on CM (Chaff Matrix). The CM was generated from raw feature and interweaved with raw template according to OM (Orientation Matrix), such that a cancelable template was designed to protect the voiceprint. Problems of fake and decrease of interspaces for CPs (Chaff Points) in FV (Fuzzy Vault) were solved by the mixture on a thinner layer. Mathematical analysis explained the proposal doesn't deteriorate the performance, because of the same distance change of features, the experimental results also showed the validity was achieved.