Component-based Network Ciphertext Database System

With the increasingly development of Computer and Communication technology, information sharing over the Internet steps into a new flourish stage, and security of network database system becomes more important. Network cryptography database is an effective method to realize system security. In order to prevent intruders from stealing or tampering with crucial information, the fundamental requirements for Network Cryptography Database System are to identify the parties involved, to protect information from unauthorized access and to apply signature on encrypted data.This article describes the elements of Public Key Infrastructure (PKI) and show how they are well suited to provide reliable secure services. In addition, it describes the criterion and implementation of Component Object Model (COM) in detail. Finally, according to the request for secure data transmission in an open network, a design scheme for a component-based Network Cryptography Database System, an adopter of PKI technology is developed.The scheme implements enterprise security communication platform based on certificate authority (CA). Besides role-based access control, it provides for identity authentication, encryption to keep information confidential, data integrity, and nonrepudiation. It also enables the use of encryption and digital signature services in a consistent manner across a wide variety of applications and does authentication hi a way that is transparent to end users with its own compatible and scalable PKI components based on COM / DCOM (Distribute COM).