Each Public Key Infrastructure (PKI) is just as secure as the used private keys. These private keys act as a unique identifier for each individual and allows them to securely access networks or protected web sites, or digitally sign data and transactions, with true proof of their authenticity. An effective strong authentication and digital signature process depends how secure the private key is kept. If private keys are generated and stored in a software environment, such as on a PC or in the key store of a smartphone, they can be exposed and  ...

The SSL protocol allows client/server applications to communicate across a network in a way designed to prevent eavesdropping, tampering, and message forgery. SSL provides endpoint authentication and communications confidentiality over the Internet using cryptography. Especially commercial web offers use this protocol to identify authorized users.
 
More than this the client may use the public key to validate the CA's digital signature on the server certificate. If the digital signature can be verified, the client accepts the ser ...