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Encryption and Decryption System

Objective: Design and implement secure network applications using standard cryptographic libraries in Java. Client and server side with signature verification.

Features

  • End-to-end encrypted communication between client and server
  • Digital signatures for message authentication + integrity
  • Secure file transfer potential
  • Easy connection termination

Key systems: RSA/ECB/PKCS1Padding, 256-bit AES key, AES/CBC/PKCS5Padding, MD5 Hash,

Three Active Commands:

ls - sends a list of filenames avaliable for download. get - request server to send contents of the file. bye - client has no more requests the connection is closed.

How to run?

  1. Start server
  2. Run client
  3. Communicate using commands to interact with system