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Q:
What is
Computer Forensics?
A:
There are several
definitions. However, most will include the following concepts,
even if stated somewhat differently: Computer forensics is
considered to be the use of analytical and investigative techniques
to identify, collect, examine and preserve digital information in a
manner that allows it to be used as evidence.
Q:
What is the difference between computer
forensics and digital forensics?
A:
Generally, the concepts overlap,
but digital forensics may be the more contemporary expression and
more inclusive, recognizing forensic services directed at more types
of devices besides those that have been traditionally considered
computers, such as cell phones, landline phones, cameras, sound
recorders, personal digital assistants, networks including the
internet and world wide web and others.
Q:
What is evidence?
A:
Any matter of fact that tends to
prove or disprove an element in a lawsuit. A system of rules and
standards is used to determine which information is reliable and
authentic and is relevant and may be admitted as being more
probative than prejudicial and to what extent a judge or jury may
consider that information (weight), as proof of a particular fact
element in a lawsuit.
Q: What kinds of cases may have need of computer forensic evidence?
A: A forensic investigation can be initiated for a variety of reasons. The most high profile are usually with respect to criminal investigation, or large scale civil litigation, but digital forensic services can be of value in a wide variety of situations. About 85% of all corporate data is stored electronically, more than 93% of new data is stored electronically, and approximately 75% of this information may never be printed. Consequently, in almost every legal matter, critical and relevant evidence can reasonably be expected to be stored electronically.
Proper collection and examination of this evidence is critical to preserve the evidence, and to manage cost. Acting proactively may me necessary and appropriate to avoid accusations of spoliation in discovery.
Computer forensics is the methodology used to ensure that electronic evidence is properly acquired and handled. It is well documented in the media that computer or digital evidence has provided the "smoking gun" in high profile cases. With most new information in businesses of all sizes being created, stored and transmitted on computer systems, it makes it necessary to consider what digital evidence may exist in every case.
Q: What are common scenarios?
Q: How
is a computer forensic investigation approached?
A:It's
a combination of art and science. However, very broadly, the main
phases are: secure the subject system (from tampering during the
operation); take a copy of hard drive or other mass storage media
(as appropriate); identify and recover all files (including those
deleted) and slack space; access/copy hidden, protected and
temporary files; study 'special' areas on the drive; investigate
data/settings from installed applications/programs; assess the
system as a whole, including its structure; consider general factors
relating to the users activity; create detailed report. Throughout
the examination, it is important to stress that a detailed log of
the examiner's activities is maintained.
Q:
Is there anything that should NOT be done during an
investigation?
A: It
is important to avoid modifying the data, even date/time stamps
may be sources of relevant information in a case where the
questions that need to be answered relate to when something
happened (Rebooting may cause files to update and compromise the
quality of evidence that can be recovered).
Q: How much do
computer forensic investigations typically cost?
A:
The cost of a computer forensic investigation varies greatly,
depending on the number and types of systems involved and the
complexity of the recovery of evidence. The proper framing of
the questions to be answered is critical to the management of
examinations.
A complete examination of a single Terabyte hard drive may have over 200,000,000 pages of electronic information and may take between 15 to hundreds of hours or more to examine, depending on the amount of data, types of data, condition of the media and data and the questions to be answered. A reasonable quote can be obtained prior to the start of the examination if complete and accurate information about the systems is available to the examiner, and the scope of the examination is clear (i.e. the questions that need to be answered).
This time could increase or decrease, depending upon the type of operating system used, the type of data contained within the system, and the size and amount of data in question. The hourly rate for computer forensic examiners generally, ranges from under $100 per hour up to $600 per hour.
At IT Forensics, Inc., our examiners hourly rates vary from $200 per hour up to $375 per hour, depending upon the specific service required. In most instances, examination and reporting can be completed in less than 20 hours, and the total analysis usually totals less than $8,000.00 for a single hard drive.
We charge a reduced hourly rate for equipment operation time if our personnel are not actively involved in that process, but periodically monitoring (typically for one system this fee is $30.00-50.00 per hour).
Q: Can evidence
be recovered from Blackberry's, PDA's, cell phones, recorders
and digital cameras?
A: Yes,
evidence can be extracted from virtually any electronic device
or component that has non-volatile memory.
Q: Should you retain a company/team of digital forensic examiners or a solo practitioner?
Q: In what types of cases can a digital forensic examiner make a contribution?
If you have questions, we've got answers! Please submit questions to
info@itforensics.com, or call our office to speak to a member of
our staff.
Do not include
attorney-client privileged information, attorney work product
information or other confidential information in your question.
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