Home > About Steganography
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Contents:
- Introduction
- What is Steganography?
- Why use Steganography?
- Who uses Steganography?
- How many are using Steganography?
- Steganographic Techniques
- LSB
- Palette Modification
- DCT
- Detecting Steganography
- Future of Steganography
- Summary
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Introduction
The word steganography is derived from the Greek words steganos which
means covered and graphie which means writing. Thus, steganography
literally means "covered writing." Steganography has been used throughout history
for secret communications. Criminals have always sought ways to conceal their activity
in real, or physical space. The same is true in virtual, or cyber space.
Digital steganography represents a particularly significant threat today
because of the large number of digital steganography applications freely available
on the Internet that can be used to hide any digital file inside of another digital
file. Use of these applications, which are both easy to obtain and simple to use,
allows criminals to conceal their activities in cyber space. In fact, the
NIJ Guide for Electronic Crime Scene Investigation for First Responders
states that potential digital evidence in child abuse, child exploitation, and terrorism
investigations includes information regarding steganography. Thus, steganography
presents a significant challenge to those who investigate it because detecting hidden
information and then extracting that information is very difficult and may be impossible
in some cases.
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