Client side, server side and identity authentication system and method

The invention discloses a client side, a server side and an identity authentication system and method. The method includes the steps that vocal print characteristics of a user are reserved and used as the vocal print recognition reference characteristics in the user identity authentication process; in the following process, when an authentication request of the client side user is received and identity authentication is conducted; dynamic verification codes generated at random are sent to the client side user, the user is made to read the dynamic verification codes in a voice mode to generate voice information, correctness of voice information of the user is verified based on the dynamic verification codes and reserved reference characteristics, when the vocal print characteristics included in the voice information are the same as the reference characteristics and semantic content included in the voice information is the same as the semantic content of the dynamic verification codes, the user can pass identity authentication. It can be shown that on the basis of biological characteristics (vocal print) and by the combination of the dynamic information verification principle, user identity authentication is achieved, and compared with an existing authentication mode based on physical equipment, the identity authentication method is higher in safety and can guarantee user benefits to the higher degree.