Transcript Introduction to Computer Forensics

Steganography
 Steganography is the art and science of writing hidden
messages in such a way that no one apart from the sender and
intended recipient even realizes there is a hidden message
(Wikipedia, the free encyclopedia)
 Like encryption, steganography involves the securing of
information through the manipulation of data [1]
 By contrast, cryptography obscures the meaning of a message,
but it does not conceal the fact that there is a message
(Wikipedia). Steganography is designed to hide the data from
the view [1]
 Steganography is the science of hiding information. Whereas
the goal of cryptography is to make data unreadable by a third
party, the goal of steganography is to hide the data from a third
party (Garry C. Kessler) [2]
History
 The word steganography is of Greek origin and means
"covered, or hidden writing".
 The term steganography was introduced at the end of
the 15th century
 The use of steganography dates back several
millennia.
 In ancient times, messages were hidden on the back of
wax writing tables, written on the stomachs of rabbits,
or tattooed on the bald head of soldiers
Steganographic
Message
 Steganographic Message has three parts:
 container
or carrier: the file which conceals
data
 hidden message: the actual data
 steganography key: could be the hidden
message was also encrypted, or the key was
used for the steganography method
References
1. Marjie T. Britz, Computer Forensics and Cyber
Crime, An Introduction
2. http://www.garykessler.net/library/steganography.html
3. http://en.wikipedia.org/wiki/Steganography