Consider the following three-message mutual authentication and key establishment protocol, which is based on a shared symmetric key KAB For each of the following cases, briefly explain whether or not...

Consider the following three-message mutual authentication and key establishment protocol, which is based on a shared symmetric key KAB

For each of the following cases, briefly explain whether or not the resulting protocol provides an effective means for secure mutual authentication and a secure session key K

a. Message 1: E("Alice",K,R_A,K_AB), Message 2: R_A, E(R_B,K_AB)

b. Message 1: "Alice", E(K,R_A,K_AB), Message 2: R_A, E{R_B,K)

c. Message 1: "Alice", E(K,R_A,K_AB), Message 2: R_A, E(R_B,K_AB)

d. Message 1: "Alice", R_A, Message 2: E(K,R_A,R_B,K_AB)