|
|
|
Hashing Over Forensic Training
Hello Everyone!
In our training classes and in forensic forums there is much discussion over the use of hashing or more specifically the use of a hash function. In this edition of our newsletter, I would like to describe the purpose of a hash function, how it can be used in video and imaging forensics, and some resources for implementing hash functions in your case work. Simply put, a hash function is a mathematical formula that turns a computer file into a number. The number, often called a hash value, is generated in such a manner that another file would not produce the same hash value. The hash value is considered the "digital fingerprint" of the file and is typically used to uniquely identify that particular file. Any changes or alterations to that file, no matter how slight, would completely change the hash value. In video and imaging forensics, hash functions can be used to uniquely identify the files received and/or created in our casework. The Federal Rules of Evidence provide that faithfully copied digital media is considered an original if proof exists that the copy is the same as the original (FRE 1001 (3)). Therefore, files downloaded from a digital video security system onto a jump drive and then copied to a CD-R can still be considered the original by using a hash function. The same is true for files generated on flash media in a digital camera. These files are still considered original when they are downloaded and copied to a CD-R. Two examples of hash functions are MD5 and SHA-1. A wide variety of programs are available that utilize these hash functions. The good news is that no matter what program you use a hash function should be the same. For example, the MD5 hash function in a program like MD5summer will provide the same hash value for a file as the MD5 hash function in a program like Iside. Both of these programs and a host of others are available for free or a nominal fee. Another option would be a more robust file management program like QuickDownloader from Advant-ics (www.advant-ics.com) that authenticate the handling, authenticating and disseminating of digital image files. To learn more about a forensic workflow that includes utilizing a hash function attend one of the following classes: Digital Video and Adobe Photoshop offered May 19 - 22, 2008 in Tucson, AZ or October 28 - 31, 2008 near San Francisco, CA. The next class in Tucson, AZ is nearly full with only 3 seats available. Contact us today is you would like to attend.
Adobe Photoshop for Forensic Video Analysts offered July 28 - 31, 2008 near Denver, CO. This four-day class is our most thorough on Photoshop and is taught by two top instructors: George Reis and Casey Caudle. Students who have attended this class in the past consistently remark on the impact this class has on their ability to process images from video evidence.
More information on both of these classes is available in this email below or on our website at www.resvid.com. Space is limited - contact us today to reserve your seat!
I'll see you in class!
Dorothy
__
Dorothy Stout
Resolution Video Inc.
www.resvid.com
703-759-7803
|
|
Digital Video and Adobe Photoshop
|
 Learn techniques for processing and enhancing digital video evidence from recovery to image clarification. This four-day class provides effective techniques for the recovery, playback and analysis of video file as well as image processing techniques using Adobe Photoshop.
The first two days of Digital Video and Adobe Photoshop covers processes for handling codecs and players, file conversion techniques, and video file processing tools. The next two days covers image clarification techniques for digital video images using Adobe Photoshop CS3. After taking this class, many students remark "This class changed my approach to digital video evidence!"
Where & When
3 SEATS REMAINING - REGISTRATION DEADLINE MAY 9, 2008
Tucson Police Department
Tucson, AZ
May 19 - 22, 2008
SPACE AVAILABLE - REGISTRATION DEADLINE OCTOBER 3, 2008
Pittsburg Police Department
Martinez, CA (near San Francisco)
October 28 - 31, 2008
Cost
$895.00
Registration
Click here for more information and to access our on-line registration form for the class in Tucson, AZ.
Click here for more information and to access our on-line registration form for the class in Martinez, CA.
|
Forensic Video Analysis for Avid - Level 1
|
 Learn practical analysis and enhancement techniques using the Avid system! This three-day class focuses on what you need to know for everyday examinations of video evidence. Multiple hands-on exercises on real video evidence ensure you understand and can apply these forensic examination techniques.
One of our previous students stated: "After taking the basic Ocean Systems class, I had a general
understanding of how to use the Avid system. With your class, I can
better utilize the tools in the Avid system and feel confident in my
abilities. You really taught us practical applications."
This class is appropriate for people who are new to the Avid system as well as those people in need of a refresher. For more information and to register, click here.
Where & When
3 SEATS REMAINING - REGISTRATION DEADLINE JULY 11, 2008
Lakewood Police Department
Lakewood, WA (near Seattle/Tacoma, WA)
July 28 - 30, 2008
Cost
$895.00
Registration
Click here for more information and to access our on-line registration form for the class in Lakewood, WA.
|
Digital Video Evidence Recovery - NEW
|
 1 SEATS REMAINING - REGISTRATION DEADLINE MAY 30, 2008
Digital video surveillance systems present a multitude of challenges when attempting to recover the video evidence of an incident. Understanding the best practices and guidelines is helpful but putting that knowledge to the test is indispensable!
Digital Video Evidence Recovery provides you with the opportunity to work on a variety of digital video surveillance systems in an attempt to recover video evidence!
Most methods of recovery will be demonstrated and practiced in this three-day class providing you with a better understanding of how to recover the "best evidence".
Where & When
Fairfax County Police Department
Chantilly, VA (near Washington, DC)
June 17 - 19, 2008
Cost
$895.00
Registration
Click here for more information and to access our on-line registration form.
|
Adobe Photoshop for Forensic Video Analysts
|
 SPACE AVAILABLE - REGISTRATION DEADLINE JULY 11, 2008
Adobe Photoshop CS3 is a valuable tool for the examination and clarification of video evidence. Adobe Photoshop for Forensic Video Analysts is a 4-day class designed to introduce and build upon the necessary image processing skills for analog and digital video evidence.
Taught by two leading industry experts, George Reis and Casey Caudle, this class is an excellent opportunity for students new to Adobe Photoshop as well as experienced analysts. Topics include the forensic analysis workflow, pixel aspect ratio corrections, custom filters for de-blurring, sharpening and pattern elimination, and color isolation techniques.
Where & When
Broomfield Police Department
Broomfield, CO (near Denver)
July 28 - 31, 2008
Cost
$895.00
Registration
Click here for more information and to access our on-line registration form.
|
Forensic Digital Photography
|
 SPACE AVAILABLE - REGISTRATION DEADLINE AUGUST 8, 2008
With the digital camera you use to document incidents and crime scenes, gain
practical experience in forensic photography and photo problem solving. This
two-day class is full of exercises allowing you to see what works and what
doesn't!
Forensic Digital Photography covers such
topics as correcting bad exposures, fill flash, and common photography scenarios
such as night time, indoor, injuries, computers and cell phones. If you use a
digital camera for investigative documentation, this class is a must.
Where & When
Kent Police/Fire Training Center
Kent, WA (near Seattle)
September 3 - 4, 2008
Cost
$425.00
Registration
Click here for more information and to access our on-line registration form.
|
|
|
|
|
