A. Figure 10.22 shows a unidirectional authentication that authenticates Alice for Bob. Change this figure to provide bidirectional authentication: to authenticate Alice for Bob and then Bob for...

for Bob. Change this figure to provide bidirectional authentication: to authenticate Alice for Bob and then Bob for Alice.

B. Change Figure 10.23 to allow bidirectional authentication. Alice needs to be authenticated for Bob and Bob for Alice.

C. Change Figure 10.24 to allow bidirectional authentication. Alice needs to be authenticated for Bob and Bob for Alice.