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The idea for this protocol comes from Steve Bellovin and Michael Merritt back in 1992. There have been many, many variations on this protocol, many of which are still in use today. This protocol starts from Diffie-Hellman, which you should remember from Unit 3, where each party starts, they have agreed on the generator and some modulus. The client picks a random XA value, raises g to that power, sends the result to the server. The server picks a random XB value, raises g to that power, and sends the result to the client. They can both now compute the same key by raising the value they received to the power of their random value. The problem with Diffie-Hellman for authentication is if theres an active attacker, that attacker can change the values, send something different, set up a shared key independently with each party, and act as a middle attacker intercepting all the traffic because the attacker knows the keys on these 2 separate channels. The idea of encrypted key exchange is t
