Consider the following encryption scheme for a block cipher (using the notation frequently used in class). y1 = ek(x1 ⊕ IV), y2 = ek(x2), y3 = ek(x3), etc. a. Suppose IV is a block consisting entirely of zeros. Which mode of operation does the described mode reduce to? b. Describe the corresponding decryption scheme. c. Can encryption and/or decryption be run in parallel for this scheme?

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A:

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A:

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A: Dear Student, The answer to each question with sufficient explaination is given below -

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A: Solution 1)