decrypt.py encrypt.py >- Terminal Enter the input file name: encrypted .txt Enter the output file name: a Enter the distance value: 3 Traceback (most recent call last): File "decrypt.py", line 13, in 3 File: decrypt.py 4 Decypts an input string of lowercase letters and prints 5 the result. The other input is the distance value. infile = open(inputFile, "r") FileNotFoundError: [Errno 2] No such file or directory: 'encrypted.txt' 8 inputFile = input ("Enter the input file name: ") 9 outputFile = input("Enter the output file name: ") 10 distance = int( input("Enter the distance value: ")) 11 clearText = "" 12 13 infile = open (inputFile, "r") 14 outfile = open(outputFile, "w") 15 get = infile. readlines() | 16 17 for letter in codedText: 18 ordvalue = ord( letter ) cypherValue = ordValue if (cypherValue < ord( 'a' ) ): cypherValue = ord( 'z' ) - ( distance - ( ord( 'a' ) - 19 distance 20 21 ordValue + 1 )) 22 clearText += chr( cypherValue ) 23 # end of for loop 24 25 print (clearText) 26 decrypt.py encrypt.py >- Terminal Enter the input file name: encrypted .txt Enter the output file name: a Enter the distance value: 3 Traceback (most recent call last): File "decrypt.py", line 13, in 3 File: encrypt.py 4 Encypts an input string of lowercase letters and prints 5 the result. The other input is the distance value. infile = open(inputFile, "r") FileNotFoundError: [Errno 2] No such file or directory: 'encrypted.txt' 8 inputFile = input ("Enter the input file name: ") 9 outputFile = input("Enter the output file name: ") 10 distance = int( input("Enter the distance value: ") ) 11 code = 12 13 infile = open (inputFile, "r") 14 outfile = open(outputFile, "w") 15 get = infile. readlines () 16| 17 for letter in plainText: 18 ordvalue = ord( letter ) cypherValue = ordValue + distance if( cypherValue > ord( 'z') ): cypherValue = ord( 'a' ) + distance - ( ord( 'z' ) - 19 20 21 ordValue + 1) 22 code += chr( cypherValue ) 23 # end of for loop 24 25 print( code ) 26

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

decrypt.py
encrypt.py
>- Terminal
Enter the input file name: encrypted
.txt
Enter the output file name: a
Enter the distance value: 3
Traceback (most recent call last):
File "decrypt.py", line 13, in <mo
dule>
3 File: decrypt.py
4 Decypts an input string of lowercase letters and prints
5 the result. The other input is the distance value.
infile = open(inputFile, "r")
FileNotFoundError: [Errno 2] No such
file or directory: 'encrypted.txt'
8 inputFile = input ("Enter the input file name: ")
9 outputFile = input("Enter the output file name: ")
10 distance = int( input("Enter the distance value: "))
11 clearText = ""
12
13 infile = open (inputFile, "r")
14 outfile = open(outputFile, "w")
15 get = infile. readlines()
| 16
17 for letter in codedText:
18
ordvalue = ord( letter )
cypherValue = ordValue
if (cypherValue < ord( 'a' ) ):
cypherValue = ord( 'z' ) - ( distance - ( ord( 'a' ) -
19
distance
20
21
ordValue + 1 ))
22
clearText += chr( cypherValue )
23 # end of for loop
24
25 print (clearText)
26
Transcribed Image Text:decrypt.py encrypt.py >- Terminal Enter the input file name: encrypted .txt Enter the output file name: a Enter the distance value: 3 Traceback (most recent call last): File "decrypt.py", line 13, in <mo dule> 3 File: decrypt.py 4 Decypts an input string of lowercase letters and prints 5 the result. The other input is the distance value. infile = open(inputFile, "r") FileNotFoundError: [Errno 2] No such file or directory: 'encrypted.txt' 8 inputFile = input ("Enter the input file name: ") 9 outputFile = input("Enter the output file name: ") 10 distance = int( input("Enter the distance value: ")) 11 clearText = "" 12 13 infile = open (inputFile, "r") 14 outfile = open(outputFile, "w") 15 get = infile. readlines() | 16 17 for letter in codedText: 18 ordvalue = ord( letter ) cypherValue = ordValue if (cypherValue < ord( 'a' ) ): cypherValue = ord( 'z' ) - ( distance - ( ord( 'a' ) - 19 distance 20 21 ordValue + 1 )) 22 clearText += chr( cypherValue ) 23 # end of for loop 24 25 print (clearText) 26
decrypt.py
encrypt.py
>- Terminal
Enter the input file name: encrypted
.txt
Enter the output file name: a
Enter the distance value: 3
Traceback (most recent call last):
File "decrypt.py", line 13, in <mo
dule>
3 File: encrypt.py
4 Encypts an input string of lowercase letters and prints
5 the result. The other input is the distance value.
infile = open(inputFile, "r")
FileNotFoundError: [Errno 2] No such
file or directory: 'encrypted.txt'
8 inputFile = input ("Enter the input file name: ")
9 outputFile = input("Enter the output file name: ")
10 distance = int( input("Enter the distance value: ") )
11 code =
12
13 infile = open (inputFile, "r")
14 outfile = open(outputFile, "w")
15 get = infile. readlines ()
16|
17 for letter in plainText:
18
ordvalue = ord( letter )
cypherValue = ordValue + distance
if( cypherValue > ord( 'z') ):
cypherValue = ord( 'a' ) + distance - ( ord( 'z' ) -
19
20
21
ordValue + 1)
22
code += chr( cypherValue )
23 # end of for loop
24
25 print( code )
26
Transcribed Image Text:decrypt.py encrypt.py >- Terminal Enter the input file name: encrypted .txt Enter the output file name: a Enter the distance value: 3 Traceback (most recent call last): File "decrypt.py", line 13, in <mo dule> 3 File: encrypt.py 4 Encypts an input string of lowercase letters and prints 5 the result. The other input is the distance value. infile = open(inputFile, "r") FileNotFoundError: [Errno 2] No such file or directory: 'encrypted.txt' 8 inputFile = input ("Enter the input file name: ") 9 outputFile = input("Enter the output file name: ") 10 distance = int( input("Enter the distance value: ") ) 11 code = 12 13 infile = open (inputFile, "r") 14 outfile = open(outputFile, "w") 15 get = infile. readlines () 16| 17 for letter in plainText: 18 ordvalue = ord( letter ) cypherValue = ordValue + distance if( cypherValue > ord( 'z') ): cypherValue = ord( 'a' ) + distance - ( ord( 'z' ) - 19 20 21 ordValue + 1) 22 code += chr( cypherValue ) 23 # end of for loop 24 25 print( code ) 26
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