Steganography

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Steganography

• Casey Workman

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What is steganography?

• Hiding a secret message within a larger one in
  such a way that others cannot discern the
  presence or contents of the hidden message.
  http//dictionary.reference.com/search?qsteganogr
  aphy
• Used as early as 440 BC by the Greek historian,
  Herodotus, to warn of the approaching Persian
  army.

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Steganography or Cryptography?

• Cryptography is meant to obfuscate the message
  so that no one can read it.
• Steganography is meant hide the fact that a
  message is even being sent

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• 21650e52cb7a82638b93971684f6dcfceb14c9ab
• this is a test encrypted with SHA1

• Has the words this is a test hidden in the
  photo.

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Invisible Inks

• Organic inks
• Developed inks

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Null Ciphers

• Non encoded messages
• Usually an on-the-spot option
• "Highway evacuation is suspected. Police report
  emergency situations in downtown ending near
  Tuesday
• Yields he is president

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U.S.S. Pueblo

• American research ship
• Captured by the North Koreans in 1968
• Used secret hand gestures to discredit the photos

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Hiding messages in picture

• A 640x480 picture is nothing more than an array
  of pixels
• Each pixel is represented by a RGB value
• Each color code is a number from 0 -255

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• Change the four least significant bit
• Thats one and a half characters per pixel
• That picture can hold over 400,000 characters

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Spammers latch on

• My goal is to support the company's sustained
  success," he said. So I was resolute in wanting
  to build my own box. "I knew how much had been
  taken but how it was taken was an absolute
  mystery to me," he said. It advised any customer
  holding an EPA who is denied access to a
  particular account to complain to the bank in
  question. Jurgle Search Blog To build or not to
  build. 15 per share proposal - which is
  conditional on seeing Boots' books - would become
  a definite offer.2 billion new mobile phone
  subscribers over the next five years. In
  endorsing the KKR bid, Alliance Boots chairman,
  Sir Nigel Rudd, said he was "delighted that the
  board has been able to achieve such a good price
  for shareholders".Name Email address Town and
  Country Phone number (optional) Comments The
  BBC may edit your comments and cannot guarantee
  that all emails will be published.News of the
  bidding war sent shares in the High Street
  chemist and drugs firm up 8. About 200 of the
  UK's 9,500 petrol stations are thought to have
  been

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References

• http//en.wikipedia.org/wiki/Steganography
• http//www.szgti.kando.hu/mtoth/download/stego/St
  eganography.pdf
• http//www.strangehorizons.com/2001/20011008/stega
  nography.shtml
• http//www.jjtc.com/stegdoc/sec202.html
• http//dictionary.reference.com/search?qsteganogr
  aphy
• http//www.truecrypt.org/