Aiming at the characteristic that the document transmiting must be reliability and security,generalizes three schemes of digital signature in e-government,and then presents a scheme of digital signature based on hybrid cryptosystem.

Against the problem of the security and complexity of the electronic document, we propose a method of combining the hybrid cryptosystem and digital signature, and for the practicality and flexility, We use the technique of component object model We integrate seamlessly this system into the microsoft word softwar

For a detailed analysis, it studies principles and the process of the authentication mechanisms as the initiative to attack, as well as passive attacks on the encryption mechanism, which focuses on a data encryption technologies-hybrid cryptosystem.

Aiming at the increasing demand of the network security,based on the IPSec protocol and the chaotic cryptosystem technology,a new network security framework which was running on the Linux platform and integrating with the chaotic cryptosystem was proposed.

Novel cryptosystem and general framework for digital audio information hiding;

Cryptoanalysis of cryptosystems based on the quadratic residue problem;

Semantically secure digital multimedia cryptosystem;

Applied Research of Contemporary Cryptography in Network Digital Film Enlargement System;

Study and Implementation of XML Blind Signature Based on Elliptic Curve Cryptography;

The development of NTRUEncrypt Algorithm is one of the most importantachievements in cryptography.