Question: Suppose we are using a three-message mutual authentication protocol, and Alice initiates contact with Bob. Suppose we wish Bob to be a stateless server, and

Suppose we are using a three-message mutual authentication protocol, and Alice initiates contact with Bob. Suppose we wish Bob to be a stateless server, and therefore it is inconvenient to require him to remember the challenge he sent to Alice.Lets modify the protocol so that Bob (still stateless) sends both a challenge, and a challenge encrypted with a key K_Bob that only he knows.Is this protocol Secure?

Alice Suppose we are using a three-message mutual authentication protocol, and Alice initiates I'm Alice contact with Bob. Suppose we wish Bob to be a stateless server, Bob

Alice and therefore it is inconvenient to require him to remember the challenge R,K_Bob{R} he sent to Alice.Lets modify the protocol so that Bob (still stateless) Bob

Alice sends both a challenge, and a challenge encrypted with a key K_Bob K_Bob{R},K_Alice_Bob{R} $that only he knows.Is this protocol Secure? AliceI'm AliceBob AliceR,K_Bob{R}Bob AliceK_Bob{R},K_Alice_Bob{R}Bob$ Bob

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