Adding More Privacy to Users of Existing Messengers

Environment: VC6, SP4, NT4, Win2K, Win9x

Introduction

SQLProxy is a program created for adding more privacy to users of existing messengers (first, Yahoo Messenger and later MSN, ICQ...). In the first versions, only Yahoo! messenger protocol is supported.

Updates will be found at squrelayerproxy.sourceforge.net.

How It Works

SQLProxy will run on your computer and a friend's computer. Acting as an HTTP proxy, it will intercept the messages before they are sent on the network and will encrypt them. At their destination, SQLProxy will decrypt them. SQLProxy is acting as an HTTP proxy, but it knows just enough Yahoo! messenger protocol to encrypt/decrypt the message's content. The transfer of files is not encrypted in any other way.

You need only to set a secret key with your friend (by phone or mail, not by messenger). Encryption is done with DES provided by the Crypt++ library. I have plans to add RSA (and key exchange protocol) later.

Crypt++ library is not provided here.

The sources exemplify an HTTP proxy, a simple connection forwarding to other host and port techniques and basics of Yahoo! messenger protocols. I heavily used CAsyncSocket because of its integration with MFC. Also, the sources exemplify use of Crypt++ library, a free C++ library with support for many cryptographic algorithms.

To add support for other messengers, I should get this code to a new level of generalization and I should add an improved structure, but the code is a good lesson about how to interact with an existing communication protocol without a perfect knowledge of it.

Please give me feedback if is working for you (or not) at my e-mail address.

Downloads

Download demo project -- 132 KB
Download source -- 33 KB



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: March 19, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT The 2015 Enterprise Mobile Application Survey asked 250 mobility professionals what their biggest mobile challenges are, how many employees they are equipping with mobile apps, and their methods for driving value with mobility. Join Dan Woods, Editor and CTO of CITO Research, and Alan Murray, SVP of Products at Apperian, as they break down the results of this survey and discuss how enterprises are using mobile application management and private …

  • The mobile market is white hot. Building a well-crafted product development plan that addresses market research, strategy, design, and development will provide the greatest chance for success. Each phase of an app's lifecycle is critical to the its overall success and feeds into the next step of the process of product development for the app. This white paper examines the five key phases of mobile app creation, one by one, to understand how they work together to help create a successful mobile app.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date