Research And Design Of Encryption Card Based On SD Interface

This paper researches actuality and function characteristic of the encryption card inside and outside nation, and studies the standard of the SD card and the features of the SD interface. It analyzes and compares the different ways of the encryption modules used in the encryption card currently. And it studies the smart card technology, and analysis of the characteristic of the APDU protocol during the smart card and the terminal.Applicable to mobile terminals for card encryption feature, performance and security needs, this paper presents the design of the target encryption cards, and design the SD encryption service system based on the file access. So that the encryption card can work on different operating systems and need no special drives. This paper researches and designs the types of the encryption key used by encryption card and their relationships, and the encryption / decryption processing and the structure of an encrypted file. Then it present on a mobile for the program.In terms of hardware, in meeting the performance requirements and the safety, the paper chooses the PS8005 SD control chip and the P5CC072 smart card chip for the program. The project is very agile, and makes the encryption card safer because of the safe-guard of itself. And the paper analysis and research the Characteristics of two chips, the hardware structure, and pin definitions and interface.On the software side, the paper analysis and researches on the four components of the COS including transmission management, security systems, applications management and documents management in deep. It present on the SdCOS which adapt to the SD encryption card. And it analysis and researches the core model and the application model, and gives the achievement.At the end, the paper studies the key technologies in the COS deeply, including the management of the documents, the security system in COS and the key management. And gives the solution in the SdCOS.