Question: consider the following protocol here C and D are two users Kpud is a shared key, c is the public key of C and Nc

consider the following protocol here C and D are two users Kpud is a shared key, c is the public key of C and Nc and Nd are the nonces
C-> D. E(kpud,[Nc,C])
D-> C. E(kpud,[Nc,Nd])
C-> D. E(kpud,Nd)
1. This protocol is vulnerable to an attack describe the attack
2.Propose a solution to fix the protocol

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