Encrypt

This project implements a simple file encryption system using the XTEA (eXtended Tiny Encryption Algorithm). It is designed to encrypt and decrypt text files using a 256-bit encryption key. This project is primarily for educational purposes and demonstrates how to handle file encryption, decryption, key management, and data integrity.

Features

• XTEA Encryption: A block cipher that encrypts files using a 256-bit key.
• File Padding: Adds padding to ensure the file length is a multiple of 8 bytes for encryption.
• Checksum: A simple XOR-based checksum is used to verify data integrity.
• Key Generation: A random 256-bit key is generated for encryption.
• Key Management: The program allows for secure generation and usage of encryption keys.
• Text File Support: The encryption and decryption is designed to work with text files.

How to Use

1. Clone this repository:

   git clone https://github.com/AngelCruzGtur/Encrypt.git
   cd Encrypt
   2. Compile the project:
   
   

2. After cloning the repository, compile the project using a C++ compiler (e.g., G++).

• For Linux/MacOS:

  g++ -std=c++11 main.cpp functions.cpp -o file_encryption
  

• For Windows using MinGW (make sure MinGW is installed):

  g++ -std=c++11 main.cpp functions.cpp -o file_encryption.exe
  

This will compile the source files main.cpp and functions.cpp and create an executable named file_encryption (or file_encryption.exe on Windows).

3. Run the program:

After compiling the program, run the executable:

• On Linux/MacOS:

  ./file_encryption
  

• On Windows:

  file_encryption.exe
  

4. Encrypt/Decrypt text files:

The program will prompt you to enter the name of the text file you want to encrypt or decrypt.

• If you are decrypting, provide the key file that was generated during encryption.

Example Usage

• To encrypt a text file:

• Enter the name of the text file you want to encrypt.

• The program will generate a key and encrypt the file.

• To decrypt a text file:

• Provide the encrypted file and the key file used during encryption.

Security Considerations

• XTEA is used for educational purposes and may not be suitable for production use due to known cryptographic weaknesses.
• Key management is critical for the system's security. Ensure that encryption keys are stored securely (e.g., in encrypted storage or hardware security modules).
• Data Integrity: The XOR-based checksum is not cryptographically secure. For improved security, consider using HMAC or a more secure checksum algorithm.

License

This project is licensed under the GNU General Public License v3.0 (GPL-3.0). See the LICENSE file for more details.

Contributing

Feel free to contribute to this project by opening issues or submitting pull requests. If you have any suggestions for improvements or bug fixes, please open an issue!

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