Encryption and Alternate Data Stream

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Submitted on: 11/23/2003 7:16:42 PM
By: Philip Pierce
Level: Intermediate
User Rating: Unrated
Compatibility:C#, VB.NET, C++.NET

Users have accessed this code 903 times.

(About the author)

This project does three things. The first is that it allows you to encypt any file using one of four different encryption algorithms. Once a file is encrypted, you can send the encrypted file to a partner. Your partner can use this program to view the decrypted contents of the file - WITHOUT THE DECRYPTED CONTENTS BEING WRITTEN TO THE HARD DRIVE. This gives extra security, in that even after a file is deleted, it is not truely deleted. This way, the partner never leaves decrypted information on their hard drive which can be recovered using off the shelf software or government recovery software. If you want to securely remove the original unencrypted file from your computer, I suggest you use PGP Tools to wipe the file. The second part of this project will add any file to the Alternate Data Stream of another file. Please note that this only works with files residing on NTFS partitions (Windows NT 3.5, 4.0+, Windows 2000, Windows XP). Alternate data streams were originally discussed on PSC by Alexandru Ionescu, which can be found at: http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=47617&lngWId;=1. The Alternate Data Stream can be considered a "hidden" file attached to a "visible" file. You can find more information at: http://patriot.net/~carvdawg/docs/dark_side.html. I have created a class which allows you to read or write any file stream to the Alternate Data Stream of a file. Because of time constraints, I did not include the code to use the Backup API to view all ADS's attached to a file. In the comments of this class, you can find links to more reference material regarding the ADS and C#. Finally, I am having a contest with this project. I have included four jpgs in a zip file enclosed in the project zip file. For each image decrypted, I will award $20. If you can decrypt all four images, I will award an additional $100, for a total of $180. I am posting this contest on Rent A coder, subject "Encryption Contest". You have until Christmas Day, 2003 to decrypt the images. Each image was encrypted only once, using the algorithms found in this project. Each image is different in some fashion. Good Luck. Votes and comments are appreciated. Also, please realize that I am not trying to say that my encryption techniques are unbreakable, because I know they can be broken. However, I would like to know how difficult they are to beat.

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    Copyrighted Philip Pierce, 2003. All rights reserved.

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