Write a Python function that wil be called Encrypt1. It\'s input will be a plain

Question

Write a Python function that wil be called Encrypt1. It's input will be a plaintext message plaintext and its output will be the ciphertext after substitution via the chart below. The plaintext letter is BOLDED on the left, and its corresponding row-column value is on the right:

PYTHON: (I recommend storing this at the top of your code as a global varibale named keysquare.

keysquare = {'Q':'AA', 'C':'AD', '3':'AF', 'T':'AG', '6':'AV', 'W':'AX',
'M':'DA', 'O':'DD', 'E':'DF', 'H':'DG', 'N':'DV', 'L':'DX',
'8':'FA', 'A':'FD', '4':'FF', '2':'FG', '1':'FV', 'I':'FX',
'G':'GA', 'B':'GD', '5':'GF', 'Z':'GG', 'R':'GV', '7':'GX',
'S':'VA', 'X':'VD', '9':'VF', 'V':'VG', 'U':'VV', 'P':'VX',
'0':'XA', 'K':'XD', 'J':'XF', 'F':'XG', 'D':'XV', 'Y':'XX'}

Your job for Encrypt1 Python function is to use substitution to create a ciphertext where each letter in the plaintext is represented by its value in the keysquare. Ignore all spaces and punctuation. For example, the input *?H E L L O WORLD 123!!!~# would return DGDFDXDXDDAXDDGVDXXVFVFGFA.

It may have the following Python psuedocode:

INPUT: plaintext

OUTPUT: ciphertext

********************************

def Encrypt1(plaintext):

Initialize the ciphertext to an empty string.

for letter in plaintext:

If the letter is represented in the keysquare (A-Z, 0-9):

Append its corresponding keysquare value to the ciphertext

Return the ciphertext

Explanation / Answer

CODE:

# Encrypt1 function starts here.
def Encrypt1(plaintext):

   # dictionary is defined here.
   keysquare = {'Q':'AA', 'C':'AD', '3':'AF', 'T':'AG', '6':'AV', 'W':'AX',
'M':'DA', 'O':'DD', 'E':'DF', 'H':'DG', 'N':'DV', 'L':'DX',
'8':'FA', 'A':'FD', '4':'FF', '2':'FG', '1':'FV', 'I':'FX',
'G':'GA', 'B':'GD', '5':'GF', 'Z':'GG', 'R':'GV', '7':'GX',
'S':'VA', 'X':'VD', '9':'VF', 'V':'VG', 'U':'VV', 'P':'VX',
'0':'XA', 'K':'XD', 'J':'XF', 'F':'XG', 'D':'XV', 'Y':'XX'}
  
   # get all the keys defined in dictionary
   keyList = keysquare.keys()
  
   # create a list to store the encrypted string.
   output = list()
  
   # iterate through the input string
   for i in plaintext:
       # if each character in string is part of the keys, then
       # encrypt the same.
       if i in keyList:
           temp = keysquare.get(i)
           output.append(temp)
  
   # print the outputs.
   print 'INPUT: ' + plaintext
   print 'OUTPUT: ' + ''.join(output)
  
Encrypt1("*?H E L L O WORLD 123!!!~#")

OUTPUT:

>python encrypt.py
INPUT: *?H E L L O WORLD 123!!!~#
OUTPUT: DGDFDXDXDDAXDDGVDXXVFVFGAF

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