Steganography

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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

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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

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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

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References

• 1. Marjie T. Britz, Computer Forensics and Cyber
  Crime, An Introduction
• 2. http//www.garykessler.net/library/steganograph
  y.html
• 3. http//en.wikipedia.org/wiki/Steganography