alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] message = input("Enter your message: ").lower() digit_in_msg = True def has_digit(a): for i in a: if i.isdigit(): return True digit_in_msg = has_digit(message) while digit_in_msg == True: print("Input should only contain alphabets") message = input("Enter your message again: ").lower() digit_in_msg = has_digit(message) def encrypt_alpha(msg): new_code = "" for i in msg: if i == " ": new_code += " " else: code = alphabet.index(i) - 1 new_code += alphabet[code] print(new_code) encrypt_alpha(message)

alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] message = input("Enter your message: ").lower() def check_input(a): for i in a: if i == " ": is_valid = True elif i.isalnum(): is_valid = True else: is_valid = False return is_valid is_valid_input = check_input(message) while is_valid_input == False: print("Input should be only alphabets and numbers") message = input("Enter your message again: ").lower() is_valid_input = check_input(message) def encrypt_alpha(msg): new_code = "" for i in msg: if i == " ": new_code += " " elif i.isdigit(): num_index = numbers.index(i) - 1 new_code += numbers[num_index] else: alpha_code = alphabet.index(i) - 1 new_code += alphabet[alpha_code] print(new_code) encrypt_alpha(message)

alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] special_char = ["!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "_", "-", "+", "=", "|", "\\", "{", "[", "]", "}", ";", ":", "<", ">", ",", ".", "?", "/"] message = input("Enter your message: ").lower() def encrypt_message(msg): new_code = "" for i in msg: if i == " ": new_code += " " elif i.isdigit(): num_index = numbers.index(i) - 1 new_code += numbers[num_index] elif i in special_char: char_index = special_char.index(i) - 1 new_code += special_char[char_index] else: alpha_code = alphabet.index(i) - 1 new_code += alphabet[alpha_code] return new_code print("Your encrypted message is:",encrypt_message(message))

alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] special_char = ["!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "_", "-", "+", "=", "|", "\\", "{", "[", "]", "}", ";", ":", "<", ">", ",", ".", "?", "/"] message = input("Enter your message: ").lower() shift = 0 new_word = '' my_list = [] new_string='' empty_str = '' for i in message: if i == ' ': my_list.append(empty_str) empty_str = '' else: empty_str += i if empty_str: my_list.append(empty_str) print("Your input was:",message) for words in my_list: shift += 1 for w in words: if w.isalpha(): new_word += alphabet[int(alphabet.index(w) - shift)] elif w.isdigit(): new_word += numbers[int(numbers.index(w) - shift)] elif w in special_char: new_word += special_char[int(special_char.index(w) - shift)] new_string += new_word+ ' ' new_word = '' print("Your encrypted message is:",new_string)

alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] special_char = ["!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "_", "-", "+", "=", "|", "\\", "{", "[", "]", "}", ";", ":", "<", ">", ",", ".", "?", "/"] message = input("Enter your message to decrypt: ").lower() shift = 1 def decrypt_message(msg): new_code = "" for i in msg: if i == " ": new_code += " " elif i.isdigit(): num_index = numbers.index(i) if num_index >= 9: num_index = 0 else: num_index = num_index + shift new_code += numbers[num_index] elif i in special_char: spl_index = special_char.index(i) if spl_index >= 27: spl_index = 0 else: spl_index = spl_index + shift new_code += special_char[spl_index] else: alpha_index = alphabet.index(i) if alpha_index >=25: alpha_index = 0 else: alpha_index = alpha_index + shift new_code += alphabet[alpha_index] return new_code print("Your input was:",message,"\nYour decrypted message is:",decrypt_message(message))

alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"] numbers = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'] special_char = ["!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "_", "-", "+", "=", "|", "\\", "{", "[", "]", "}", ";", ":", "<", ">", ",", ".", "?", "/"] mode_type = int(input("Please enter 1 to encrypt or 2 to decrypt ")) while (mode_type != 1 and mode_type != 2): print("Input should be 1 or 2") mode_type = int(input("Try again. Enter 1 to encrypt or 2 to decrypt: ")) message = input("Enter your message: ").lower() if mode_type == 1: shift = -1 elif mode_type == 2: shift = 1 def process_message(msg): new_code = "" for i in msg: if i == " ": new_code += " " elif i.isdigit(): num_index = numbers.index(i) if num_index >= 9: num_index = 0 else: num_index = num_index + shift new_code += numbers[num_index] elif i in special_char: spl_index = special_char.index(i) if spl_index >= 27: spl_index = 0 else: spl_index = spl_index + shift new_code += special_char[spl_index] else: alpha_index = alphabet.index(i) if alpha_index >=25: alpha_index = 0 else: alpha_index = alpha_index + shift new_code += alphabet[alpha_index] return new_code new_string = process_message(message) if mode_type ==1: print("Your message was: ", message,"\nYour encrypted message is:", new_string) elif mode_type ==2: print("Your message was: ", message,"\nYour decrypted message is:", new_string)