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4. Explanation of the Pencrypt Code
Pencrypt is a Python program designed to encrypt and decrypt messages using the Caesar Encryption method. This method involves shifting each letter of the text by a fixed number of positions down the alphabet. Below, we'll walk through the code step by step, explaining how it works based on basic Python knowledge. Also we will make many chapters, for each version one, because the code is changing every version.
python import random import time import os
The program begins by importing necessary modules. random is used to generate random numbers, time is used for creating delays, and os is used to clear the console screen.
print("starting program...")
time.sleep(0.5)
print("started successfully")
time.sleep(0.1)
print("")
os.system('cls' if os.name == 'nt' else 'clear')Here, the program prints a start-up message, pauses briefly using time.sleep(), and then clears the console screen with os.system().
print("program version: 1.0 / surfing penguin")
print("an encrypting software made by Pengu")
print("")The program prints its version information and a brief description.
def first_decision():
decision_made = False
while decision_made == False:
print("Please press E to encrypt and U to unscramble messages.")
answer = input("-> ")
if answer in ["E", "e", "encrypt", "encrypting mode"]:
print("-> encrypting mode, activated")
print("")
decision_made = True
encrypting_entrance()
elif answer in ["U", "u", "unscrambling", "unscrambling mode"]:
print("-> unscrambling mode, activated")
print("")
decision_made = True
unscramble()
else:
print(" -> Sorry please press E or U thank you. ")
print("")def encrypt_or_unscramble():
os.system('cls' if os.name == 'nt' else 'clear')
decision_made = False
while decision_made == False:
print("Please press E to encrypt and U to unscramble messages.")
answer = input("-> ")
if answer in ["E", "e", "encrypt", "encrypting mode"]:
print("-> encrypting mode, activated")
print("")
decision_made = True
encrypting_entrance()
elif answer in ["U", "u", "unscrambling", "unscrambling mode"]:
print("-> unscrambling mode, activated")
print("")
decision_made = True
unscramble()
else:
print(" -> Sorry please press E or U thank you. ")
print("")def encrypting_entrance():
os.system('cls' if os.name == 'nt' else 'clear')
print("Lets encrypt your text message!")
print("-------------------------------------------->")
print("Firstly we need an Pencrypting-Code, you can choose your")
print("own code between 1 and 26 or can use a random Code.")
encrypt()def encrypt():
code = 1
owncode = 1
decision_made = False
print("-> Please press O to use your own Code and R to get an random Code,")
print(" you also can exit encrypting mode with X.")
while decision_made == False:
answer = input("-> ")
print("")
if answer in ["O", "o", "own", "own code", "Own", "Own Code", "0"]:
print("")
print("-> Please enter your own code from 1 to 26 or exit with X")
while True:
owncode = input("-> ")
if owncode in ["X", "x", "Exit", "exit"]:
print("-> Exiting self-choosing mode")
decision_made = True
encrypt()
break
elif owncode.isdigit():
if 1 <= int(owncode) <= 25:
code = int(owncode)
decision_made = True
break
else:
print("-> Sorry, please enter a number between 1 and 26 or X to exit.")
print("")
else:
print(" -> Sorry, please enter a number or X to exit.")
print("")
elif answer in ["R", "r", "random", "random code"]:
code = random.randint(1,25)
decision_made = True
elif answer in ["X", "x", "Exit", "exit"]:
print("-> Exiting encrypting mode")
print("")
decision_made = True
encrypt_or_unscramble()
else:
print(" -> Sorry please press O, R or X thank you. ")
print("")
print(f"Nice, your Pencrypting-Code is {code}, now we can start encrypting your text message.")
message = input("Please enter it here: ")
# encrypting #
encrypted_message = ""
for char in message:
if char.isalpha():
ascii_offset = 65 if char.isupper() else 97
encrypted_char = chr((ord(char) - ascii_offset + code) % 26 + ascii_offset)
encrypted_message += encrypted_char
else:
encrypted_message += char
print(f"Your encrypted message: {encrypted_message}")
print(f"The message got created with the Pencrypt-Code {code}")The code above selects the encryption code, prompts the user for a message, and then encrypts it using the Caesar Cipher. It shifts each character in the message by the code's value, wrapping around the alphabet.
def unscramble():
os.system('cls' if os.name == 'nt' else 'clear')
print("-> Lets unscramble your text message!")
print("")
decision_made = False
while decision_made == False:
print("-> Please enter your Pencrypt-Code from 1 to 26")
print(" or exit unscrambling mode with X.")
answer = input("-> ")
if answer in ["X", "x", "Exit", "exit"]:
print("-> Exiting unscrambling mode")
print("")
decision_made = True
encrypt_or_unscramble()
elif answer.isdigit():
if 1 <= int(answer) <= 25:
code = int(answer)
decision_made = True
else:
print(" -> Sorry, please enter a number between 1 and 26 or X to exit.")
print("")
else:
print(" -> Sorry, please enter your Pencrypt-Code or press X to exit.")
print("")
os.system('cls' if os.name == 'nt' else 'clear')
print("Nice, now we can start unscrambling your text message.")
message = input("Please enter it here: ")
# unscrambling #
unscrambled_message = ""
for char in message:
if char.isalpha():
ascii_offset = 65 if char.isupper() else 97
unscrambled_char = chr((ord(char) - ascii_offset - code) % 26 + ascii_offset)
unscrambled_message += unscrambled_char
else:
unscrambled_message += char
print(f"Your unscrambled message: {unscrambled_message}")
print(f"The message got unscrambled with the Pencrypt-Code {code}")print("Welcome to Pencrypt, your nice and easy software to encrypt and")
print("unscramble text messages with the Caesar encryption technique.")
print("")The program greets the user with a welcome message.
first_decision()
input("Press Enter to exit...")Finally, the program starts by calling first_decision() and waits for the user to press Enter to exit.
Pencrypt is a simple yet effective program for encrypting and decrypting messages using the Caesar Cipher technique. It provides an easy-to-use interface, allowing users to securely encode their messages with either a chosen or random code. The program's design ensures that it is lightweight and fast, making it a practical tool for protecting your communications.