IP Security Architecture

A digital signature or a MAC can be used to provide a cryptographic integrity check.

a. Suppose that Alice and Bob want to use a cryptographic integrity check. Which would you recommend that they use, a MAC or a digital signature? Why?

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b. Suppose that Alice and Bob require a cryptographic integrity check and they also require non-repudiation. Which would you recommend that Alice and Bob use, a MAC or a digital signature? Why?

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?

 

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