Caesar Cipher Implementation in C++

This project is a simple implementation of the Caesar Cipher algorithm in C++. The Caesar Cipher is a type of substitution cipher where each letter in the plaintext is shifted by a fixed number of positions down or up the alphabet. The program provides both encryption and decryption functionalities.

Features

• Encryption: Encode a given text using a specified shift key.
• Decryption: Decode a given encrypted text using a specified shift key.
• Caesar Cipher Table: Displays the Caesar Cipher alphabet mapping for reference.
• Character Transformation Table: Shows the character-by-character transformation from plaintext to ciphertext (and vice versa).

How It Works

Encryption

Each letter in the plaintext is shifted by a specified number (key). For example, with a key of 3, A becomes D, B becomes E, and so on. The program handles both uppercase and lowercase letters, while non-alphabetic characters remain unchanged.

Decryption

Decryption reverses the process of encryption by shifting each letter in the ciphertext back by the same number (key). This restores the original plaintext.

Usage

1. Clone the repository to your local machine.
2. Compile the code using a C++ compiler (e.g., g++):

   g++ -o caesar_cipher caesar_cipher.cpp

Run the compiled program: bash Sao chép mã ./caesar_cipher Follow the on-screen instructions to either encrypt or decrypt a text. Code Explanation encrypt(text, key): Encrypts the input text using the Caesar Cipher with the provided key. decrypt(text, key): Decrypts the input text using the Caesar Cipher with the provided key. printCaesarCipherTable(): Prints the Caesar Cipher alphabet mapping. printTransformationTable(text, key, isEncrypt): Prints the transformation of each character in the text during encryption or decryption. Example Here is an example of how the program works:

mathematica Sao chép mã ---MA HOA CAESAR---

Caesar Cipher Alphabet Mapping Plain Text: 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 Cipher Text: 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

1. Ma Hoa
2. Giai Ma
3. Exit Nhap lua chon[1-3]: 1

MA HOA

Nhap text can ma hoa: HELLO WORLD Shift[1-26]: 3

Key: 3 H:(7) --> K:(10) E:(4) --> H:(7) L:(11) --> O:(14) L:(11) --> O:(14) O:(14) --> R:(17) :( ) --> :( ) W:(22) --> Z:(25) O:(14) --> R:(17) R:(17) --> U:(20) L:(11) --> O:(14) D:(3) --> G:(6)

Cipher: KHOOR ZRUOG Contributing If you'd like to contribute to this project, feel free to fork the repository and submit a pull request with your improvements. Suggestions, bug reports, and feature requests are welcome!