Design and Realization of Electronic Seal Middleware Oriented E-Government;

Research and Implementation of Electronic Seal System Based on Digital Signature and Quadratic Residue;

It is essential that enterprises have electronic seal to enforce their power and assure the safety of their information systems.

This thesis makes deep research on the all kinds of the techniques about electronic signature firstly.

Traditional written documents, autographs and signature, which used to be commonly used for confirming rights and responsibilities as well as transactions, have been gradually replaced by electronic documents and electronic signature.

Meanwhile, the public faith to ED and the legal validity of it become a problem need to solve immediately, and electronic signature is the solution to the problem.

Study and design of digital seal system based on identity-based encryption;

By the increasingly development of digital government affair system and OA system, the authorizing of digital document and the implement of digital seal present more advanced condition to people cooperating with each other.

Electronic signature, electronic certification and the law of electronic signature appear accordingly.

Electron signature seal,as modern authentication technology,guarantees for its rapid transmission and security of information.