an affine cipher equation (Y=aX+b) used to encrypt English language messages, hich of the following can be used as a valid encryption equation (here 'y' is the phertext character corresponding to the plaintext character 'x' & the suggestions r (a,b) keys are given) nt: For decryption we need inverse of a Hence select the value of a in such a way that it satisfies this condition. ABCDEFGHIJKLMNOP 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 9 21 15 3 19 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
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q9- 

If an affine cipher equation (Y=aX+b) used to encrypt English language messages,
which of the following can be used as a valid encryption equation (here 'y' is the
ciphertext character corresponding to the plaintext character 'x' & the suggestions
for (a,b) keys are given)
Hint:
• For decryption we need inverse of a
Hence select the value of a in such a way that it satisfies this condition.
ABCDEFGHIJKLMNOP
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1
9 21
15 3
19
7
OY=22X+13
O Y=13x+12
O All of them are valid equations
O Y= 3X+5
Transcribed Image Text:If an affine cipher equation (Y=aX+b) used to encrypt English language messages, which of the following can be used as a valid encryption equation (here 'y' is the ciphertext character corresponding to the plaintext character 'x' & the suggestions for (a,b) keys are given) Hint: • For decryption we need inverse of a Hence select the value of a in such a way that it satisfies this condition. ABCDEFGHIJKLMNOP 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 9 21 15 3 19 7 OY=22X+13 O Y=13x+12 O All of them are valid equations O Y= 3X+5
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