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[Music] in the last lesson we picked apart this slide we talked specifically how the client and the server were trying to do symmetric encryption for confidentiality and a message authentication code for integrity specifically we talked about how authentication didnt come into play until the certificate authority arrived on the scene the certificate authority provided authentication of the certificate which then provided authentication to the symmetra keys used for the message authentication code the main idea there is you cannot attain these three things confidentiality integrity and authentication unless you have all three of these key players and these three key players all form a triangle known as the public key infrastructure anytime you have an instance of a client server and certificate authority you have a public key infrastructure so lets talk about it so there are three entities which form a pki the client the server and the ca the client is the entity that needs to connec