3) In the following protocol, Alice and Bob want to connect to each other in a secure way: (6 points) Alice KDC : IDAlice II IDBob 11 Ni (Nrls a nonce) Alice Bob : E(Ks'[KsII IDAlice]) Bob Alice : E(Ksl N2]) Alice Bob E(Ksll f(N)]) Explain the process b) Any possible attack? Explain c) How we can make the approach more secure? 3) In the following protocol, Alice and Bob want to connect to each other in a secure way: (6 points) Alice KDC : IDAlice II IDBob 11 Ni (Nrls a nonce) Alice Bob : E(Ks'[KsII IDAlice]) Bob Alice : E(Ksl N2]) Alice Bob E(Ksll f(N)]) Explain the process b) Any possible attack? Explain c) How we can make the approach more secure