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Commiteae240e

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add caesar cipher tutorials
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‎README.md‎

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@@ -47,6 +47,8 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
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-[How to List Wi-Fi Networks in Python](https://thepythoncode.com/article/list-nearby-wifi-networks-with-python). ([code](ethical-hacking/listing-wifi-networks))
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-[How to Verify File Integrity in Python](https://thepythoncode.com/article/verify-downloaded-files-with-checksum-in-python). ([code](ethical-hacking/verify-file-integrity))
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-[How to Create a Zip File Locker in Python](https://thepythoncode.com/article/build-a-zip-file-locker-in-python). ([code](ethical-hacking/zip-file-locker))
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-[How to Implement the Caesar Cipher in Python](https://thepythoncode.com/article/implement-caesar-cipher-in-python). ([code](ethical-hacking/caesar-cipher))
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-[How to Crack the Caesar Cipher in Python](https://thepythoncode.com/article/how-to-crack-caesar-cipher-in-python). ([code](ethical-hacking/caesar-cipher))
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-###[Machine Learning](https://www.thepythoncode.com/topic/machine-learning)
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-###[Natural Language Processing](https://www.thepythoncode.com/topic/nlp)
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#[How to Implement the Caesar Cipher in Python](https://thepythoncode.com/article/implement-caesar-cipher-in-python)
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#[How to Crack the Caesar Cipher in Python](https://thepythoncode.com/article/how-to-crack-caesar-cipher-in-python)
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importsys# The sys module for system-related operations.
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fromcoloramaimportFore,init# Import the colorama for colored text
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init()# Initialize the colorama library for colored text.
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defimplement_caesar_cipher(message,key,decrypt=False):
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# Initialize an empty string to store the result.
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result=""
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# Iterate through each character in the user's input message.
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forcharacterinmessage:
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# Check if the character is an alphabet letter.
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ifcharacter.isalpha():
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# Determine the shift amount based. i.e the amount of times to be shifted e.g 2,3,4....
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shift=keyifnotdecryptelse-key
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# Check if the character is a lowercase letter.
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ifcharacter.islower():
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# Apply Caesar cipher transformation for lowercase letters.
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result+=chr(((ord(character)-ord('a')+shift)%26)+ord('a'))
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else:
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# Apply Caesar cipher transformation for uppercase letters.
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result+=chr(((ord(character)-ord('A')+shift)%26)+ord('A'))
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else:
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# Preserve non-alphabet characters as they are.
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result+=character
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returnresult# Return the encrypted or decrypted result.
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# Prompt the user to enter the text to be encrypted
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text_to_encrypt=input(f"{Fore.GREEN}[?] Please Enter your text/message: ")
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# Prompt the user to specify the shift length (the key).
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key=int(input(f"{Fore.GREEN}[?] Please specify the shift length: "))
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# Check if the specified key is within a valid range (0 to 25).
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ifkey>25orkey<0:
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# Display an error message if the key is out of range.
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print(f"{Fore.RED}[!] Your shift length should be between 0 and 25 ")
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sys.exit()# Exit the program if the key is invalid.
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# Encrypt the user's input using the specified key.
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encrypted_text=implement_caesar_cipher(text_to_encrypt,key)
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# Display the encrypted text.
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print(f"{Fore.GREEN}[+]{text_to_encrypt}{Fore.MAGENTA}has been encrypted as{Fore.RED}{encrypted_text}")
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# Import colorama for colorful text.
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fromcoloramaimportFore,init
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init()
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# Define a function for Caesar cipher encryption.
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defimplement_caesar_cipher(text,key,decrypt=False):
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# Initialize an empty string to store the result.
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result=""
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# Iterate through each character in the input text.
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forcharintext:
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# Check if the character is alphabetical.
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ifchar.isalpha():
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# Determine the shift value using the provided key (or its negation for decryption).
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shift=keyifnotdecryptelse-key
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# Check if the character is lowercase
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ifchar.islower():
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# Apply the Caesar cipher encryption/decryption formula for lowercase letters.
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result+=chr(((ord(char)-ord('a')+shift)%26)+ord('a'))
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else:
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# Apply the Caesar cipher encryption/decryption formula for uppercase letters.
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result+=chr(((ord(char)-ord('A')+shift)%26)+ord('A'))
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else:
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# If the character is not alphabetical, keep it as is e.g. numbers, punctuation
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result+=char
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# Return the result, which is the encrypted or decrypted text
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returnresult
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# Define a function for cracking the Caesar cipher.
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defcrack_caesar_cipher(ciphertext):
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# Iterate through all possible keys (0 to 25) as there 26 alphabets.
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forkeyinrange(26):
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# Call the caesar_cipher function with the current key to decrypt the text.
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decrypted_text=implement_caesar_cipher(ciphertext,key,decrypt=True)
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# Print the result, showing the decrypted text for each key
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print(f"{Fore.RED}Key{key}:{decrypted_text}")
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# Initiate a continuous loop so the program keeps running.
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whileTrue:
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# Accept user input.
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encrypted_text=input(f"{Fore.GREEN}[?] Please Enter the text/message to decrypt: ")
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# Check if user does not specify anything.
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ifnotencrypted_text:
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print(f"{Fore.RED}[-] Please specify the text to decrypt.")
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else:
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crack_caesar_cipher(encrypted_text)
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colorama

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