Solved

Encase Version 5 - Hash analysis

Posted on 2006-11-27
11
1,025 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
Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.

 
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

Enterprise Mobility and BYOD For Dummies

Like “For Dummies” books, you can read this in whatever order you choose and learn about mobility and BYOD; and how to put a competitive mobile infrastructure in place. Developed for SMBs and large enterprises alike, you will find helpful use cases, planning, and implementation.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Set cookies HttpOnly and Secure 4 107
Ipad question 2 80
Vulnerability assesment , how much should I charge? 3 79
SQL BACKUP - 2008 R2 8 59
Big data transfers via information superhighways require special attention and protection. Learn more about the IT-regulations of the country where your server is located. Analyze cloud providers and their encryption systems for safe data transit. S…
Find out what Office 365 Transport Rules are, how they work and their limitations managing Office 365 signatures.
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…
Concerto provides fully managed cloud services and the expertise to provide an easy and reliable route to the cloud. Our best-in-class solutions help you address the toughest IT challenges, find new efficiencies and deliver the best application expe…

929 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

11 Experts available now in Live!

Get 1:1 Help Now