Research And Application Of The Key Technologies Of Combined Public Key

User authentication is the basis of secure network communications. This thesis researched the authentication technology of Combined Public Key (CPK) which has independent intellectual property in China. The problems of keys collision and the selection of elliptic curve were studied deeply. The CPK Intelligent Card (CPK-IC) was designed for the actual demand of our military.The main results and contributions in this thesis are as follows.1. The challenges to the Public Key Infrastructure (PKI) were analyzed, and the advantages and disadvantages of the Identity Based Encryption (IBE) and the CPK were discussed. It pointed out that the CPK was applicable to the closed and controllable network.2. In order to solve the problem of keys collision in the computing process, the methods of separating the columns'order of magnitude in the matrix and restricting the parameters of the elliptic curve were proposed. The validity of this method was proved in theory.3. Based on the requirement of elliptic curve parameters by CPK, the CM method was selected to generate an elliptic curve by comparing the different methods of obtaining the elliptic curve parameters. A pair of key matrix was generated, which is composed of key factors that operated on the elliptic curve.4. The main contents and structure of CPK-IC based on the CPK authentication techniques were designed. The processes of the data interchange and computing of authenticating the identity and encrypting e-mail by the CPK-IC were designed and simulated.CPK authentication technology has obvious advantages in the application of the specific field. The studies in this thesis play a facilitating role in CPK authentication technology's popularization.