Answered: Problem #1 Given below is a well-known…

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

See similar textbooks

Related questions

Concept explainers

Question

Problem #1
Given below is a well-known cryptosystem called affine Caesar cipher, as well as some
ciphertext generated using the affine Caesar cipher.
P = C = Z 26 = {0, 1, 2, ..., 25};
K = {(a, b) Z26 Z26 | gcd(a, 26) = 1}
y = E([a,b], x) = (ax + b) mod 26,
x = D([a,b], y) = a-1 (y – b) mod 26,
where x P, y C.

Ciphertext sample:
VPWOMFUWOFMYMHUNWBBWGCRVVPSFVPUTHUJWMC
OMFUOVSVWOVWGSRSFSREOWOQMHKOBMHVPWOUFG
HETVWMFOEOVUYVMMZCVGSFEMCCOUEMCHKFMQRU
NIUMBRWFUSHSRIUZHSVMBWFNVPUOUGHUVKUEVM
MVPUFEMCQWRRPSJUVHCREGHSGKUNVPUOEOVUY

For this problem, please do the following:
(a) provide an analysis detailing its strength/weakness;
(b) attempt to uncover the plaintext associated with the ciphertext;
(c) attempt to determine the secret key (a, b) used.

Expert Solution

Step by step

Solved in 3 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.

Similar questions