Question: undefined 4. (16 points) (a) (8 points) Suppose you are given a secure PRF that takes a fixed size block as input. Explain how to

undefined 4. (16 points) (a) (8 points) Suppose you are given a undefined

4. (16 points) (a) (8 points) Suppose you are given a secure PRF that takes a fixed size block as input. Explain how to use the PRF for symmetric encryption of arbitrary size messages. (b) (8 points) Explain how you would use a secure PRF for authenticated encryption, that is to provide both encryption and integrity for arbitrary size inputs

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