Public Key Infrastructure (PKI) is a set of policies and procedures that are needed to create, store and revoke digital signatures (along with other things). PKI is a facilitator when it comes to securing the electronic transfer of information such as digital signatures and other network activities. In this case, it binds the public key with the identities of people or organizations (i.e. their private key). The binding of this information is done due through a process of registration and issuance of certificates by a Certificate Authority (CA).