CA digital certificate can provide electronic authentication for secure communication between bidders, use electronic signature to ensure the authenticity and integrity of electronic bidding documents, realize identity identification and electronic information encryption, and authenticate the identity of certificate holders by verifying the authenticity of identity information. \x0d\ has the functions of bidding, encryption, authentication, integrity and legality, which can not only simplify the user's operation, but also help bidders reduce costs. At the same time, it can effectively maintain the security of the electronic bidding system and effectively protect the information security and legitimate rights and interests of all bidding units from infringement. \x0d\ With the tool software, not only can the tender be made, but also the electronic tender can be directly certified by CA and digitally signed through the tool after the tender is made, which reproduces the process of manual signature and signature where signature and signature are needed in the paper tender, and also reduces the workload of the tenderer in preparing the tender. The electronic tender generated by the compiling tool with one click is a complete and legally effective tender. \x0d\ has the following advantages: 1. Simple, convenient, fast and efficient \x0d\ (1) The use of digital certificate reduces the burden of memorizing complicated user names and passwords for bidders, and inserting digital certificate can realize safe and effective encryption and authentication. \x0d\ (2) Different from the limitation that traditional CA authentication requires networking, the tool software can directly perform instant CA authentication without networking, thus solving the burden of bidders. \x0d\ (3) Online bidding is applicable. With digital certificates, it is no longer necessary to submit paper materials with official seals and corporate seals. Through the digital certificate and electronic signature, it can completely guarantee its legitimacy, low carbon and energy saving, and the whole process is paperless. \x0d\ II。 Security, reliability and privacy \x0d\ Through the digital certificate system, the uniqueness of identity and the non-repudiation of transactions can be confirmed, and the huge losses caused by the tampering of bidding documents can be prevented. Hangzhou electronic bidding special lock is based on the security standard of CA digital certificate to construct the whole hardware medium lock system, which greatly guarantees the security of information stored in the lock. At the same time, the generated bidding documents are digitally signed and encrypted by the CA digital certificate in the lock, and the whole operation process of signing and encryption is completed by the hardware media lock program, without the support of other systems and programs, which ensures the sealing of the electronic bidding documents at the first time after generation and the information security of the electronic bidding documents. Digital certificates represent the unique identity of bidders, which can effectively prevent others from stealing or using their identities. \x0d\ III。 Clear legal effect and responsibility \x0d\ According to the provisions of People's Republic of China (PRC) Electronic Signature Law, "a reliable electronic signature has the same legal effect as a handwritten signature or seal". The hardware medium used by the special lock for electronic bidding documents in Hangzhou has been certified by the State Cryptography Administration, and the adopted cryptographic security system conforms to the C-level standard of military passwords. When using the electronic seal in the lock, first verify the security password of the CA digital certificate and ensure that the signature is signed by the owner of the CA digital certificate. Therefore, the signed electronic seal meets the requirements of People's Republic of China (PRC) Electronic Signature Law, and the final electronic tender is guaranteed to have legal effect. \x0d\ Electronic bidding for digital certificates has legal effect, which is undeniable. Once a dispute occurs, the original data can be verified by verifying the electronic signature to distinguish the responsible parties.