P8.10 Playfair cipher. Another way of thwarting a simple letter frequency analysis of an encrypted text is to encrypt pairs of letters together. A simple scheme to do this is the Playfair cipher. You pick a keyword and remove duplicate letters from it. Then you fill the keyword, and the remaining letters of the alphabet, into a 5 x 5 square. (Since there are only 25 squares, I and J are considered the same letter.) Here is such an arrangement with the keyword PLAYFAIR. PLAYF IRBCD EGHKM NOQST UVWXZ To encrypt a letter pair, say AM, look at the rectangle with corners A and M: PLAYF IRBCD EGHKM NOQST UVWXZ The encoding of this pair is formed by looking at the other two corners of the rectangle, in this case, FH. If both letters happen to be in the same row or column, such as GO, simply swap the two letters. Decryption is done in the same way. Write a program that encrypts or decrypts an input text according to this cipher.

P8.10 Playfair cipher. Another way of thwarting a simple letter frequency analysis of an encrypted text is to encrypt pairs of letters together. A simple scheme to do this is the Playfair cipher. You pick a keyword and remove duplicate letters from it. Then you fill the keyword, and the remaining letters of the alphabet, into a 5 x 5 square. (Since there are only 25 squares, I and J are considered the same letter.) Here is such an arrangement with the keyword PLAYFAIR. PLAYF IRBCD EGHKM NOQST UVWXZ To encrypt a letter pair, say AM, look at the rectangle with corners A and M: PLAYF IRBCD EGHKM NOQST UVWXZ The encoding of this pair is formed by looking at the other two corners of the rectangle, in this case, FH. If both letters happen to be in the same row or column, such as GO, simply swap the two letters. Decryption is done in the same way. Write a program that encrypts or decrypts an input text according to this cipher.

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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