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.