PublicKeyInfrastructure (PKI for short), called public key infrastructure in Chinese, is an infrastructure established using a public key mechanism. PKI refers to a mechanism for the production and distribution of certificates. Under the premise of the guarantee of this mechanism, reliable network communication is carried out. That is, a secure network communication guarantee mechanism. pki technology is the core of information security technology and the key and basic technology of e-commerce. The basic technologies of pki include encryption, digital signature, data integrity mechanism, digital envelope, double digital signature, etc.

Advantages:

1. Using public key cryptography technology, it can support non-tamperable digital signatures. The digital signature includes the verifier’s identity information, verification information and other data. It can ensure the security of digital certificates. At the same time, during the verification process, the verifier's information can be traced, providing higher protection for data security.

2. Support offline identity verification. Digital certificates based on PKI technology support offline identity verification. Since the digital certificate is issued by the CA third-party certification center, the user's identity verification information and identity verification key are already stored in the digital certificate. There is no need to query online during the identity verification process, providing a multi-identity verification method.

3. The PKI system includes the revocation service of CA digital certificates, allowing users to control the application of digital certificates, ensuring the security of users’ identity information in various environments, and preventing identity information from being compromised. Malicious applications after loss or theft provide a controllable security mechanism for CA digital certificates.

4. PKI technology has good network interaction capabilities. PKI technology can provide an effective security mechanism for the interacting systems of both parties through the network, and can provide security services for large-scale distributed networks and more complex network environments, so that the transmission of network data is effectively guaranteed.