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    The Caesar Cipher is a simple encryption technique where each letter in the plaintext is shifted by a fixed number of positions in the alphabet. Below is a Python implementation for both encryption and decryption.

    Code Implementation

    # Function to encrypt the plaintext
    def caesar_encrypt(plaintext, shift):
    encrypted = ""
    for char in plaintext:
    if char.isalpha():
    shift_base = ord('A') if char.isupper() else ord('a')
    encrypted += chr((ord(char) - shift_base + shift) % 26 + shift_base)
    else:
    encrypted += char # Non-alphabetic characters remain unchanged
    return encrypted

    # Function to decrypt the ciphertext
    def caesar_decrypt(ciphertext, shift):
    return caesar_encrypt(ciphertext, -shift)

    # Example usage
    if __name__ == "__main__":
    plaintext = "Hello, World!"
    shift = 3

    # Encrypt the plaintext
    ciphertext = caesar_encrypt(plaintext, shift)
    print(f"Encrypted: {ciphertext}")

    # Decrypt the ciphertext
    decrypted_text = caesar_decrypt(ciphertext, shift)
    print(f"Decrypted: {decrypted_text}")
    Copied!

    How It Works

    1. Encryption: Each letter is shifted by the specified shift value. The ASCII value of the character is adjusted using modular arithmetic to wrap around the alphabet.

    2. Decryption: The same function is reused with a negative shift to reverse the encryption process.

    3. Non-Alphabet Characters: Characters like spaces, punctuation, and numbers remain unchanged.

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    How to Implement the Caesar Cipher in Python
    Python Code
    How do I learn Caesar cipher?

    Practice by modifying the code, adding new features, or combining Caesar cipher with other encryption techniques. Remember that while Caesar cipher is not secure for real-world use, it provides an excellent foundation for understanding cryptography and developing Python programming skills.

    caesar-cipher.com
  1. Stack Overflow
    https://stackoverflow.com › questions

    Caesar Cipher Function in Python - Stack Overflow

    Jan 17, 2012 · I'm trying to create a simple Caesar Cipher function in Python that shifts letters based on input from the user and creates a final, new string at the end. The only problem is that the final cipher …

    • Reviews: 2

      Code sample

      def caesar(plainText, shift):
        cipherText = ""
        for ch in plainText:
          if ch.isalpha():
            stayInAlphabet = ord(ch) + shift...
    • Python Code
      https://thepythoncode.com › article › implement-caesar...

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      The following diagram depicts the working of Caesar cipher algorithm implementation −

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    • Github
      https://github.com › xavier-oc-programming › caesar-cipher-python

      xavier-oc-programming/caesar-cipher-python - GitHub

      Caesar Cipher A command-line Caesar cipher tool written in Python — built twice, at different points in my learning journey, to show how my skills grew.

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