Apublic key is part of what security measure?

A public key or the asymmetric key which is used for the authentication process. It consists of a pair of keys in which one key encrypts and the other decrypts. It come under Public Key Infrastructure (PKI) and is a part of INFORMATION SECURITY measures. PKI is the management solution for the keys.

First, what does the figure look like? i can't tell you what it is if you don't have one up it will make people confused and can't answer the question, not trying to be rude just stating a fact.