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I:Answer the following questions. 1.In general terms, what are four means of authenticating a users identity? 2.What is RBAC and how it is related to

I:Answer the following questions.

1.In general terms, what are four means of authenticating a users identity?

2.What is RBAC and how it is related to DAC and MAC?

3.What is the difference between a block cipher and a stream cipher?

4.How many keys are required for two people to communicate via a symmetric cipher?

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