Is an integrated system of software, encryption methodologies, protocols, legal agreements, and third-party services that enables users to communicate securely?

The answer to this question is a Public Key Infrastructure. Public Key Infrastructure or PKI is a tool that enables the users to open or unsecure a network. A PKI consists of a software and hardware standards in order to manage and create digital certificates. A certificate authority, registration authority, certificate database, and a certificate store are the key elements of a PKI.