Consider the following key exchange protocol. Find and describe one vulnerability in this protocol where Eve can impersonate Alice. Propose a fix for the vulnerability, along with a short explanation why the fix works Terms: A is Alice, B is Bob .S is a Trusted Third Party and knows the public key PKa of Alice and public key PKB of Bob .Signs...) means the signature by entity S PKBC.. means encryption with the public key of EB KAB is the session key to be shared by A and B Ta is a timestamp generated by A to prevent replay attacks (doesn't mean you cannot try to do replay attacks) You can assume that at some point Alice might want to talk with Eve TTP S 7 CA A PKAI| Signs(A, PKA) Cp-B | PKB 11 Signs(B, PKB) Alice Bob