Please Have a look at my coding according to this question there is some mistakes help me with that.

question is...Write a Python program, implementing encryption/decryption without using any special security packages. The program should ask the user for encryption method, if you want to perform encryption or decryption, secret key and a text file to process. The output should be a processed file. You should implement at least two simple encryption methods, one substitution and one transposition method. For the substitution method, keep key sizes at maximum equivalent to eight bits, i.e. 28 =256 different possible keys that corresponds to one character. Make sure that you can both encrypt and decrypt files with your program.

coding is,.....

from collections import deque

import collections

import string

import math

from typing import Text

def caesar_encrypt(key, text):

alphabet_deque = collections.deque(string.ascii_uppercase + string.digits + string.punctuation)

alphabet_string = string.ascii_uppercase + string.digits + string.punctuation

A = 0

alphabet_deque.rotate(key)

Ciphertext = ""

for x in text:

if x == " ":

Ciphertext += " "

else:

A = alphabet_string.index(x)

Ciphertext += alphabet_deque[A]

return Ciphertext

def caesar_decrypt(key, text):

alphabet_deque = collections.deque(string.ascii_uppercase + string.digits + string.punctuation)

alphabet_list = string.ascii_uppercase + string.digits + string.punctuation

A = 0

alphabet_deque.rotate(key)

Ciphertext = ""

for x in text:

if x == " ":

Ciphertext += " "

else:

A = alphabet_deque.index(x)

Ciphertext += alphabet_list[A]

return Ciphertext

def encrypt(key, message): #Transposition

dummy = ((len(message) + len(key)) - (len(message) % len(key))) - len(message)

dummy_message = key + message + ("*" * dummy)

cols = int(len(key))

counter = 0

rows = math.ceil((len(dummy_message) / len(key)))

ciphertext = ""

for x in range(0, cols, 1):

counter = x

for y in range(0, rows):

ciphertext += dummy_message[counter]

counter += len(key)

return ciphertext

# Reversed encryption algorithm

def decrypt(key, ciphertext):#Transposition

cols = int(len(key))

counter = 0

counter2 = 0

rows = math.ceil((len(ciphertext) / len(key)))

text = [""] * len(ciphertext)

endtext = ""

for x in range(0, cols, 1):

counter = x

for y in range(0, rows):

text[counter] = ciphertext[counter2]

counter2 += 1

counter += len(key)

for i in range(len(key), len(ciphertext)):

endtext += text[i]

return endtext

def read_file(file_path):

lst = []

whole = ""

with open(file_path, "r") as file:

for line in file:

n = line.strip()

if n.find(", ") == -1:

n = n.split(":")

else:

n = n.split(", ")

for x in n:

if x != "":

lst.append(x)

for w in lst:

whole += w

return whole

#Used this function for clear previous messages

def write_file1(file_path, words):

with open(file_path, "w", encoding="UTF-8") as file:

word1 = ""

for word in words:

file.write(word)

return file

# Difference between first write fuction is(append)

def write_file(file_path, words):

with open(file_path, "a", encoding="UTF-8") as file:

for word in words:

file.write(word)

return file

import os

from typing import Text

import ciphers

path = os.getcwd()

right_path_A = path + "\\original_text.txt"

right_path_B = path + "\\cipher_text.txt"

right_path_C = path + "\\decrypted_message.txt"

encryption_method = int(input("Ceasar cipher: 1 Transposition cipher: 2 = "))

enc_decr = int(input("Encryptin: 1 Decryption: 2 = "))

word = ""

#My outputs will be written in one line. Because the alghorithm that I developed is simple.

#The program that asks user to inputs

if encryption_method == 1:

if enc_decr == 1:

ciphers.write_file1(right_path_B, "")# To delete previous message

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

word = ciphers.read_file(right_path_A)

word = ciphers.caesar_encrypt(key, str(word).upper())

ciphers.write_file(right_path_B, word)

else:

ciphers.write_file1(right_path_C, "")# To delete previous message

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

word = ciphers.read_file(right_path_B)

word = ciphers.caesar_decrypt(key, str(word).upper())

ciphers.write_file(right_path_C, word)

else:

if enc_decr == 1:

ciphers.write_file1(right_path_B, "") # To delete previous message

key = str(input("Please enter the text key :"))

word = ciphers.read_file(right_path_A)

word = ciphers.encrypt(key, str(word).upper())

ciphers.write_file(right_path_B, word)

else:

ciphers.write_file1(right_path_C, "")# To delete previous message

key = str(input("Please enter the text key :"))

word = ciphers.read_file(right_path_B)

word = ciphers.decrypt(key, str(word).upper())

ciphers.write_file(right_path_C, word)