Solved

Encase Version 5 - Hash analysis

Posted on 2006-11-27
11
1,021 Views
Last Modified: 2008-01-09
I have to solve a crime related to an extortion incident using Encase version 5 (for educational purpose). I do not know anything about hash analysis.
1. What the heck is it?
2. What does it accomplish?
3. How do i do it?
0
Comment
Question by:sergeiweerasuriya
  • 4
  • 3
11 Comments
 
LVL 14

Expert Comment

by:chris_calabrese
ID: 18020831
I'm guessing the meaning here is to take a hash of all the files on the system using e.g. md5 and then comparing against a database of hash values for "interesting" files.

For an extortion case, the database might have hashes for a bunch of documents related to the extortion subject. Then you can use this technique to easily find copies of those documents.

Not sure exactly how you do this in Encase 5.
0
 

Author Comment

by:sergeiweerasuriya
ID: 18020935
finding out how to do it in Encase is not difficult, if i knew what files to look for. The documents related to the extortion case are a bunch of email messages. I do not see the point in checking an email message for hash vaues. Lets say i check the hash value of an email file. If i do so what would it tell me about that particular file?
0
 
LVL 14

Expert Comment

by:chris_calabrese
ID: 18021245
Yeah, probably no so useful on an email file as much as on an individual email.
0
 

Author Comment

by:sergeiweerasuriya
ID: 18021275
what do u mean "not so useful on an email file as much as on an individual email"? what's the difference between an email file an an individual email?
0
How to improve team productivity

Quip adds documents, spreadsheets, and tasklists to your Slack experience
- Elevate ideas to Quip docs
- Share Quip docs in Slack
- Get notified of changes to your docs
- Available on iOS/Android/Desktop/Web
- Online/Offline

 
LVL 14

Expert Comment

by:chris_calabrese
ID: 18021292
The hash method usually works at the file level. An email file usually has many emails in it.
0
 

Author Comment

by:sergeiweerasuriya
ID: 18027452
So when analysing email files what should i look for. Is it only the contents of the email? Some emails seem quite bizzare to me for instance the date created, sent and recieved appear to be the same (same hour,minute and second).
0
 
LVL 14

Accepted Solution

by:
chris_calabrese earned 250 total points
ID: 18028401
For an extortion case you'd be looking primarily at content. You'd look at the timestamps and such if you thought that the emails were forged or planted.
0
 
LVL 4

Assisted Solution

by:SPOued
SPOued earned 250 total points
ID: 18044295
sergeiweerasuriya,
I've used encase (in testing only), and the "hash" being referred to seems to me to be the value which you need to use when comparing the original data to the duplicated one to insure integrity. Encase usually works by creating an exact duplicate of the data (without leaving any trace) being investigated. If you're to take a case to court, the court would like to know that the data from which you've acquired evidence has not been altered, meaning you'll need a hash to check the integrity.
So, in a nutshell, hash analysis, is just about making sure you have an exact duplicate of the original data...
Hope this helps...
0

Featured Post

Find Ransomware Secrets With All-Source Analysis

Ransomware has become a major concern for organizations; its prevalence has grown due to past successes achieved by threat actors. While each ransomware variant is different, we’ve seen some common tactics and trends used among the authors of the malware.

Join & Write a Comment

If you're not part of the solution, you're part of the problem.   Tips on how to secure IoT devices, even the dumbest ones, so they can't be used as part of a DDoS botnet.  Use PRTG Network Monitor as one of the building blocks, to detect unusual…
This paper addresses the security of Sennheiser DECT Contact Center and Office (CC&O) headsets. It describes the DECT security chain comprised of “Pairing”, “Per Call Authentication” and “Encryption”, which are all part of the standard DECT protocol.
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…

744 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now