Answered: Modify the scripts of Projects 1 and 2…

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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Question

Modify the scripts of Projects 1 and 2 to encrypt and decrypt entire files of text.

An example of the program interface is shown below:

Enter the input file name: encrypted.txt

Enter the output file name: a

Enter the distance value: 3

Project 1:

text = (input("Please enter your text: "))

shift = int(input("Please enter the shift: "))

def circularShift(text, key):

text = text.upper()

cipher = ""

for letter in text:

shifted = ord(letter) + key

if shifted < 65:

shifted += 0

if shifted > 90:

shifted -= 0

cipher += chr(shifted)

return cipher

print (circularShift(text, shift))

Project 2

text = (input("Please enter your text: "))

shift = int(input("Please enter the shift: "))

convert = -(shift)

def cypher(text, key):

text = text.capitalize()

cipher = ""

for letter in text:

shifted = ord(letter) + key

cipher += chr(shifted)

return cipher

print (cypher(text, convert))

Expert Solution

Step 1

Algorithm:

Start
Read input and output file names
Read shift
Open input file and read the text and store it in text variable
Implement a method circularShift() which takes text and key as arguments
Inside the method iterate through the text
Set shifted = ord(letter) + key
If letter is upper case, add chr((shifted-65)%26+65) to cipher
Else if letter is lower case, add chr((shifted-97)%26+97) to cipher
Else add letter to text
After completion of iteration, return cipher
Inside the main method, call circularShift() method and write the returned value to output file
Stop

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