Caesar Cipher: https://en.wikipedia.org/wiki/Caesar_cipher

Game Steps

1. Introduction: Provide a brief introduction to the Caesar Cipher, explaining that it’s a substitution cipher where each letter in the plaintext is shifted a fixed number of places down or up the alphabet.
2. Choose Operation: Ask the user whether they want to encrypt or decrypt a message.
3. Input Text: Prompt the user to enter the text they want to encrypt or decrypt.
4. Input Shift Value: Request the shift value (key) for the cipher. Ensure the value is within a valid range (typically 1 to 25).
5. Perform Operation: Apply the Caesar Cipher algorithm to the input text based on the user’s choice of encryption or decryption.
6. Display Result: Show the resulting encrypted or decrypted text to the user.
7. Play Again Option: Ask the user if they want to perform another encryption or decryption with new inputs.

Input Ideas

1. Text Input: Allow the user to input any string of text. Handle both uppercase and lowercase letters. Decide how to treat non-alphabetic characters (e.g., spaces, punctuation).
2. Shift Value: Ask the user for an integer shift value. Ensure it is within a reasonable range (1 to 25). Handle cases where the shift value is negative or greater than 25 by normalizing it.
3. Mode Selection: Provide options to select between encryption and decryption. For encryption, the shift will be added; for decryption, the shift will be subtracted.
4. Case Sensitivity: Handle uppercase and lowercase letters differently or consistently based on user preference.
5. Special Characters: Decide whether to include special characters and spaces in the encrypted/decrypted text. Define how these characters should be treated.

Additional Features

1. Input Validation: Implement checks to ensure the shift value is an integer and falls within the expected range. Validate that text input does not contain unsupported characters (if needed).
2. Help/Instructions: Provide an option for users to view help or instructions on how to use the tool, explaining the Caesar Cipher and how to enter inputs.
3. GUI Interface: Create a graphical user interface using Tkinter or another library to make the tool more accessible and user-friendly.
4. File Operations: Allow users to read from and write to text files for encryption and decryption. This is useful for larger amounts of text.
5. Brute Force Attack: Implement a brute force mode that tries all possible shifts for decryption and displays all possible plaintexts, useful for educational purposes or cracking simple ciphers.
6. Custom Alphabet: Allow users to define a custom alphabet or set of characters for the cipher, making it more flexible and adaptable.
7. Save and Load Settings: Implement functionality to save and load encryption/decryption settings, such as shift values or custom alphabets, for future use.