Public Key Authentication Protocol
Mutual authentication could be done using public key authentication. To begin with let us assume A and B want to set up a session and then use secret key cryptography on that session. The reason of this initial exchange is authenticate each other and agree on a secret shared session key.
Setup
A sends a request to AS for getting B's public key. Likewise B is trying to get the A's public key. AS sends public key of B and name of B in encrypted form using AS's private key.
Handshake
Whether it came from A or from someone else., Other than he plays along and sends A back a message containing A's n1, his own random number n2 and a proposed session key, Ks. When A received this message, he decrypts it using his private key. He sees n1 in it, and Therefore gets sure that B actually got the message. The message have to come from B, As none else can determine n1. A agrees to the session via sending back message. When B sees n2 encrypted by the session key he just generated then he knows A got message and verified n1.
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