Question: Section 1 2 . 7 listed four general approaches to provide confidentiality and message encryption: HSE, ASE, ESA, and E + A . a .

Section 12.7 listed four general approaches to provide confidentiality and message encryption: HSE, ASE, ESA, and E+A. a. Which of the above performs decryption before verification? b. Which of the above performs verification before decryption?

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