With the deepening of  information construction, especially the popularization of e-commerce and e-government, ensuring the integrity and availability of electronic information, the certainty of the identities of the two interacting parties, the non-repudiation of transaction behaviors have become the core security issues concerned in the current information construction process.The promulgation of this law provides a basic legal guarantee for the development of e-commerce and e-government in China.Digital signature supported by digital certificate technology is the technology that most conforms to the requirements of "reliable electronic signature" and "advanced electronic signature" in the electronic signature law at present. This technology has been widely promoted and applied in the fields of e-commerce and e-government in China.

The main application fields of digital signature server including online office system, enterprise information systems, such as electronic trading system need to prevent data in the network been tampered with or have nonrepudiation requirements of business system, it is  widely used in finance, insurance, food, medicine, education, scientific research and other industries, the server can meet various institutions and individuals and institutions between the key data, key operation nonrepudiation requirements, specific deployment pattern as shown below.