Dynamic password voice based identity authentication system and method having self-learning function

A dynamic security code speech-based identity authentication system having self-learning function, comprising:

• a request receiving module for receiving an identity authentication request that a requester sends to a server through a client;
• a dynamic security code generating module for generating a dynamic security code and sending the dynamic security code to the client;
• and
• an identity authentication module for calculating a comprehensive confidence of an identity of the requester by using an acoustic model of global characters and a voiceprint model of a user based on a security code speech signal sent from the client, wherein the security code speech signal is generated when the requester reads out the dynamic security code;
• judging the identity of the requester based on the calculated comprehensive confidence of the identity;
• and feeding an identity authentication result back to the client, wherein
• the dynamic security code speech-based identity authentication system is provided with an automatic reconstruction subsystem for the voiceprint model, and the voiceprint model of the user is reconstructed by the automatic reconstruction subsystem for the voiceprint model when the identity authentication result is that the requester is the user of the server, and
• the automatic reconstruction subsystem for the voiceprint model comprises:
• a time-varying data storage unit for storing speech data of each user with time labels;
• a time-varying data updating module for storing the security code speech signal as a latest speech data into the time-varying data storage unit;
• a time window channel construction module for extracting the speech data of the user from the time-varying data storage unit in an order of the time labels, constructing a time window channel including a plurality of sets of speech data, and updating the speech data included in the time window channel using the latest speech data;
• and
• a voiceprint model reconstruction module for reconstructing the voiceprint model of the user for the user using the plurality of sets of speech data included in the updated time window channel.