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Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Question
Explain how to break a character substitution cipher
Expert Solution
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Step 1
Answer:
Initially we are provided with a string of characters known as plain text and a number know as key.
- Firstly we will transform the given characters with the corresponding numbers in the alphabet.
- Now we will perform addition i.e., for encryption we use E(P) = (p+k)mod 26, for decryption we use D(C) = ( p- k) mod 26 , where p = plain text, c = cipher text, k = key.
- Finally obtained Plain text number or cipher text number we will convert it into Characters.
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