A sımple scheme to encrypt text 1s as follows: 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 NO QST U V W X Z Python • To encrypt a letter pair, say AM, look at the rectangle with corners A and M: PLAYF IRBCD EGHKM NO QST U V W X Z 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 G0, simply swap the two letters. Decryption is done in the same way. Write a program that takes as command line argument the text file to be encrypted (the source file) the encryption keyword the program should read the source file, encrypt the contents scoring to the schema above and store the encrypted contents in a file with the same name as the source file followed by :".enc" for example if the source file named data.txt, the output file should be " data.txt.enc"

A sımple scheme to encrypt text 1s as follows: 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 NO QST U V W X Z Python • To encrypt a letter pair, say AM, look at the rectangle with corners A and M: PLAYF IRBCD EGHKM NO QST U V W X Z 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 G0, simply swap the two letters. Decryption is done in the same way. Write a program that takes as command line argument the text file to be encrypted (the source file) the encryption keyword the program should read the source file, encrypt the contents scoring to the schema above and store the encrypted contents in a file with the same name as the source file followed by :".enc" for example if the source file named data.txt, the output file should be " data.txt.enc"

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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Problem Description
A simple scheme to encrypt text is as follows:
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
IRBC D
Python
EGHKM
NOQST
U V W X Z
• To encrypt a letter pair, say AM, look at the rectangle with corners A and M:
PLAYF
IRBCD
EGHKM
NOQST
UV W X Z
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 takes as command line argument
the text file to be encrypted (the source file)
the encryption keyword
the program should
read the source file,
encrypt the contents scoring to the schema above and
store the encrypted contents in a file with the same name as the source file followed
by :".enc" for example if the source file named data txt, the output file should be "
data.txt.enc"

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