In the US, insults are not something for which you can be prosecuted. Calling someone a son of a bitch is not defamatory. No one believes you are really the child of a dog. So that is an opinion. Defamation requires a false factual statement. Truth is a complete defense.
What is Public Key Infrastructure (PKI)? Public Key Infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a PKI is an arrangement that binds public keys with respective user identities by means of a certificate authority (CA). Wikipedia.org
The Public Key Infrastructure is a concept that is discussed frequently in the IT security world, but is not always well understood. Most of us know that the PKI is used for authentication and has something to do with public key pairs, but many only vaguely understand how the components of a PKI work together and the differences between private and commercial PKIs.