PKI applications

The PKI technology can satisfy the security requirements of online transactions. As an infrastructure, PKI has a wide range of applications. The following lists some common application examples:

• VPN—A VPN is a private data communication network built on the public communication infrastructure. A VPN can leverage network layer security protocols (for instance, IPsec) in conjunction with PKI-based encryption and digital signature technologies for confidentiality.

• Secure email—Emails require confidentiality, integrity, authentication, and non-repudiation. PKI can address these needs. The secure email protocol that is developing rapidly is S/MIME, which is based on PKI and allows for transfer of encrypted mails with signature.

• Web security—For web security, two peers can establish an SSL connection first for transparent and secure communications at the application layer. With PKI, SSL enables encrypted communications between a browser and a server. Both of the communication parties can verify each other's identity through digital certificates.