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?
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?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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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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