Instructions
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
Flowchart
To enlarge flowchart turn side navigation off, Click on 
in the top navigation bar to change to 
Encrypt
Decrypt
Starter Code
"""
File: encrypt.py
Probject 4.1
Encypts an input string of the ASCII characters and prints
the result. The other input is the distance value.
"""
# The ASCII values range from 0 through 127
plainText = input("Enter a message: ")
distance = int(input("Enter the distance value: "))
code = ""
for ch in plainText:
ordValue = ord(ch)
cipherValue = ordValue + distance
if cipherValue > 127:
cipherValue = distance - (127 - ordValue + 1)
code += chr(cipherValue)
print(code)
"""
File: decrypt.py
Project 4.2
Decrypts an input string characters and prints
the result. The other input is the distance value.
"""
# The ASCII values range from 0 through 127
code = input("Enter the coded text: ")
distance = int(input("Enter the distance value: "))
plainText = ''
for ch in code:
ordValue = ord(ch)
cipherValue = ordValue - distance
if cipherValue < 0:
cipherValue = 127 - \
(distance - (1 - ordValue))
plainText += chr(cipherValue)
print(plainText)