following 40-letter alphabet is used for all plaintexts and ciphertexts: A--Z with numerical equivalents 0--25, blank=26, .=27, ?=28, $=29, the numerals 0--9 with numerical equivalents 30--39. Suppose that plaintext message units are digraphs and ciphertext message units are trigraphs (i.e., k=2, l (ell)=3, 40^2 < n_{A} < 40^3 for all n_{A}). (a) Send the message "SEND $7
following 40-letter alphabet is used for all plaintexts and ciphertexts: A--Z with numerical equivalents 0--25, blank=26, .=27, ?=28, $=29, the numerals 0--9 with numerical equivalents 30--39. Suppose that plaintext message units are digraphs and ciphertext message units are trigraphs (i.e., k=2, l (ell)=3, 40^2 < n_{A} < 40^3 for all n_{A}). (a) Send the message "SEND $7
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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Write a program in python
Suppose that the following 40-letter alphabet is used for all plaintexts and ciphertexts: A--Z with numerical equivalents 0--25, blank=26, .=27, ?=28, $=29, the numerals 0--9 with numerical equivalents 30--39. Suppose that plaintext message units are digraphs and ciphertext message units are trigraphs (i.e., k=2, l (ell)=3, 40^2 < n_{A} < 40^3 for all n_{A}).
(a) Send the message "SEND $7500" to a user whose enciphering key is (n,b)=(2047,179).
(b) Break the code by factoring n and then computing the deciphering key (n,a)
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