Re: Re: Determining the encryption used

From: cwright@bdosyd.com.au
Date: Fri May 12 2006 - 18:26:10 EDT


('binary' encoding is not supported, stored as-is) Hello,
To throw in my 5 cents (2cents being abolished in AU)

There are a couple classes to consider. First is the obvious. If there are headers and footers that allow analysis than these are covered early.

Next if we look at classes where there are no headers etc to see directly what it is, there is a level of analysis required.

First is the data chunked? Does it conform to set blocks. Is it streamed?

Is there any surrounding stream information that can help?

Inferential Statistics and a good program for data mining will help. but this would be another 300-800 pages to post.

Grab a book;
Differential Cryptanalysis of the Data Encryption Standard
by Eli Biham, Adi Shamir

or as an intro to the subject;
Cryptanalysis
by Helen F. Gaines

In reality this is not a question that can easily be answered. It needs to be fleshed out. Where was the data obtained. In a file and extracted, from a stream? What supporting information is there? How was it created? How was it found? What permissions does it have?.......

Regards,
Craig

------------------------------------------------------------------------------
This List Sponsored by: Cenzic

Concerned about Web Application Security?
Why not go with the #1 solution - Cenzic, the only one to win the Analyst's
Choice Award from eWeek. As attacks through web applications continue to rise,
you need to proactively protect your applications from hackers. Cenzic has the
most comprehensive solutions to meet your application security penetration
testing and vulnerability management needs. You have an option to go with a
managed service (Cenzic ClickToSecure) or an enterprise software
(Cenzic Hailstorm). Download FREE whitepaper on how a managed service can
help you: http://www.cenzic.com/news_events/wpappsec.php
And, now for a limited time we can do a FREE audit for you to confirm your
results from other product. Contact us at request@cenzic.com for details.
------------------------------------------------------------------------------



This archive was generated by hypermail 2.1.7 : Sat Apr 12 2008 - 10:55:57 EDT