The Research On The Security Of The Online Bid System Of The Construction Project

With the development of the Internet, the Electronic Business develops rapidly. The security which is the key factor to the development of the Electronic Business is becoming more and more important.This paper presents my work on the study of the security of the bid online system in the field of construction project.The contents are:1) The background of the research.2) The encrypting technology. It is the core technology on assuring information safe that other technologies are based on. Here the foundation of the cryptology, symmetrical encrypting system, unsymmetrical encrypting system.3) The PKI (Public Key Infrastructure)/CA (Certificate Authority) frame. The PKI/CA supports authentication, confidentiality, integrality and undeniablilty. Based on SSL (Secure Socket Lay) protocol, the PKI/CA combines the symmetrical encrypting technology and unsymmetrical encrypting technology and provides a frame for the implementation of the security.4) The whole goal operation flow, hiberarchy, functions, design scheme and development environment of the Electronic Tendering System in the field of project.5) The design and implementation of the security sub-system in the Electronic Tendering System. This chapter describes how a certain PKI/CA system is implemented, including the requirement analysis, the safety scheme design, the using of the certificates the client safety, the server safety and the security at the time of unsealing the bidding files.The security implementation of this system is based on PKI/CA. The PKI/CA frame realizes the creating, storing, issuing, recalling certificates so as to provide integrity and identity authentication for the system.