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Cryptora - Offline Text Encryption System

Cryptora is a secure offline text encryption system that allows users to:

  • Register and manage user accounts with RSA key pairs.
  • Encrypt and send messages securely to other users.
  • Import public keys to communicate with external users.
  • Decrypt messages received from other users.

This system ensures that users' private keys and public keys are persistently stored for future use, eliminating the need for key regeneration.

Features

  1. User Registration

    • Create a new user account with an RSA key pair.
    • Automatically logs in after successful registration.

  2. Login

    • Log in as an existing user to access their private key and messages.

  3. Add/Import Public Key

    • Add a new user's public key to communicate securely.

  4. List Users and Public Keys

    • View all registered users and their public keys.

  5. Send Encrypted Message

    • Encrypt and send a message to a recipient using their public key.

  6. Decrypt Message

    • Decrypt messages using the logged-in user's private key.

  7. Persistent Storage

    • User data (keys and public keys) is stored in a file (userKeys.dat) for reuse across sessions.

How to Run

Prerequisites

  • Java 8 or higher installed.
  • A code editor or terminal to compile and run the program.

Steps

  1. Clone or Download the Repository 
    git clone https://github.com/your-repo/Cryptora.git
cd Cryptora
  2. Compile the Program 
    javac Cryptora.java
  3. Run the Program 
    java Cryptora

File Structure

  1. Cryptora.java: The main application file.
  2. userKeys.dat: Stores user data (keys and public keys).

Usage

  1. Register a User Select option 1 to register a new user. Provide a unique username to generate an RSA key pair.

  2. Login Select option 2 to log in to an existing account.

  3. Add Public Key Select option 3 to import a public key. You'll need the username and Base64-encoded public key.

  4. List Users Select option 4 to view all registered users and their public keys.

  5. Send Message Select option 5 to encrypt and send a message. Choose a recipient by username.

  6. Decrypt Message Select option 6 to decrypt a received encrypted message.

  7. Exit Select option 7 to save all data and exit the application.

Example Workflow

User A registers and generates an RSA key pair. User B registers and generates their own RSA key pair. User A adds User B's public key using the "Add Public Key" option. User A sends an encrypted message to User B. User B decrypts the message using their private key.

Persistent Storage

User accounts and their respective keys are saved in the userKeys.dat file. This file ensures that users' data persists across program restarts.

Notes

Always ensure the userKeys.dat file is kept secure, as it contains sensitive key data. The encryption is performed using the RSA algorithm with a key size of 2048 bits

Contributing

Feel free to fork the repository and submit pull requests for new features or bug fixes.

License

This project is licensed under the MIT License.