Alice wants to be "extra secure," so she proposes to Bob that they compute a MAC, then digitally sign the MAC. a. Does Alice's method provide a cryptographic integrity check? Why or why not? b. Does...

Alice wants to be "extra secure," so she proposes to Bob that they compute a MAC, then digitally sign the MAC.

a. Does Alice's method provide a cryptographic integrity check? Why or why not?

b. Does Alice's method provide for non-repudiation? Why or why not?

c. Is Alice's method a good idea? Why or why not?