Decrypt2Archive

Decrypt2Archive is a Java-based client-server application for decrypting and archiving files. It uses sockets for communication (java.net.ServerSocket and java.net.Socket) and processes .txt and .xls/.xlsx files encrypted with a provided encryption suite. Decrypted files are compressed into an archive and stored in a specified output directory.

Features

• Client-server architecture using java.net.ServerSocket and java.net.Socket
• Text-based communication protocol (no object serialization)
• Decrypts files using the provided encryption logic
• Supports .txt and .xls/.xlsx files
• Compresses decrypted files into a single zip
• Logs all actions into the database

Usage

Run Server

java -jar server_2.jar -p <portNumber> -d <pathToDatabase> -o <pathToOutputDir>

• portNumber: Port for the server to listen on
• pathToDatabase: Path to the SQLite database (e.g., ./database.sqlite3)
• pathToOutputDir: Destination directory for the output file

Run Client

java -jar client_2.jar -s <serverAddress> -p <portNumber> -i <pathToInputDir>

• serverAddress: Address of the server machine
• portNumber: Port number the server is listening on
• pathToInputDir: Folder with encrypted input files

Important: Start the server before launching the client.

Communication Protocol

The client and server communicate using a text-based protocol. The protocol involves the following steps:

1. Client connects to the server
2. Client sends information about files to be processed
3. Server acknowledges and begins processing
4. Server sends final result (success/failure)
5. Connection is closed

Database Schema

The SQLite database contains the following tables:

1. aes_keys - Stores decryption keys for files

   • key: Decryption key
   • file: File names

2. actions - Records all system operations

   • id: Primary key
   • action: Type of operation performed
   • date: Time of the operation

License

This project is licensed under the MIT License. Provided for educational purposes, based on a task by msgNETCONOMY. See the LICENSE file for details.