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Consider a one-way authentication technique based on asymmetric encryption: A B: : R1 A E(PRoR1) IDa ID of node A R1 = a nonce chosen by node B E = Asymmtric PRa- Private key of node A Encryption al) Explain the protarck this protocol is b) c) What type of attack this protocol is susceptible to? Modify the protocol to provide bidirectional authentication: to authenticate A for B and then B for A. You may consider that both party has public keys of each other