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Electronic Evidence Retrieval - Computer Forensics - Data Recovery - Expert Witness Testimony

Demystifying Computer Forensics

by Johnette Hassell, Ph.D. and Susan Steen

Computer Forensics - Data Recovery - Expert Witness Testimony

 

What You Should Do

When you suspect that a computer holds information about illegal activities, the most natural reaction is to want to check it out, both to avoid public knowledge of security breeches and in a desire to avoid false accusations. However, remember that merely starting the computer changes files, and many of those changes affect significant dates. Any access to the disk risks overwriting relevant information and destroys the chain of custody. In addition, there is no protection in booting from another disk or trying to examine the computer over a network.

 
The best course of action is to leave the computer alone and have a qualified forensics specialist create a certified, bit-by-bit copy of the disk(s). The copy can then be examined without jeopardizing the investigation. It is not sufficient to use utilities, such as Norton’s Ghost, to image a disk because accessing the disk in the usual fashion alters it.
 
 

But what if you have already tried looking at the disk? Stop and leave the computer exactly as it is, do not even turn it off or on. Confess to your forensic specialist what you have done and let the practitioner work from there. The worst course of action would be for you not to tell the specialist, who eventually is called in to investigate the matter, that you have accessed the disk!

A Final Word

If a matter you are working on has potential evidence on computer disks, we recommend that you engage a qualified computer forensics professional as early as possible. Not only can such professionals conduct the proper investigation we have described herein, they can assist with preparing and answering interrogatories, drafting language for search warrants, and carrying out preliminary "stealth" investigations to assess the potential evidence. In choosing a computer forensic specialist, be certain too that your choice not only knows how to conduct the disk acquisition and data retrieval, but can also provide expert reports, depositions, and testimony. Chosing a specialist who is qualified and experienced in all of these matters will be more cost effective and will simplify the coordination of professionals involved in preparing the case.

Published in Louisiana Law Journal December 2002, used by permission

 
 
 
 
 

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Learn more about Electronic Evidence Retrieval and the services we offer.
What is Computer Forensics and how can it help you?
Contact EER for more information.
Read articles related to the world of Computer Forensics.
Broaden your knowledge base with Web links to related topics.
Get answers to commonly asked questions.