eric_stego - Survey of steganography With an emphasis on...

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Survey of steganography With an emphasis on audio  techniques.
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Discussion overview What is steganography? Definition Do’s/Don’ts Steganographic techniques Images Audio Other applications Steganalysis Overview Specific audio example
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What is Steganography? Literally, “covered writing” Invisible inks Character arrangement (non-cryptographic) Wax coverings Formal Definition: “Steganography is the technique of concealing information  within seemingly innocuous carriers. It is the art and  science of writing hidden messages in such a way that no  one, apart from the sender and intended recipient, suspects  the existence of the message.” 
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“Rules of steganography” 1. Strength is not stealth Stegonography =/= Cryptography Not exclusive 2. Assume the hiding method is known Known as Kerchkoff’s principle in crypto 3. Never divulge side information 4. Don’t add noise to a where it doesn’t  belong Cover images Audio
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Steganographic Techniques
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Steganographic techniques: Images Common approaches: LSB modification Masking Filtering Transformations via algorithms Not all approaches created equal Size restrictions Vulnerability to manipulation
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Steganographic techniques: Images, LSB Composed of hiding information inside of the  LSB of an image Leads to a few requirements: Image must have suitable “noise” Image must be of sufficient size Must be able to “hide in plain sight” Advantages/Disadvantages Easy to implement Does not stand up to compression Scalability
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Steganographic techniques: Images, Masking and Filtering Most commonly seen as watermarks as a mean to  protect copyright Not traditional steganography in that information is  being extended, not hidden Accomplished not by hiding in noise, but by  manipulating luminescence Changes visible properties of an image, but can be  still made to be undetectable to the human eye Advantages/Disadvantages More suitable for lossy compression than LSB Not traditional stego
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Steganographic techniques: Images, Algos and trans Based on transformation via formula
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This note was uploaded on 01/17/2012 for the course CIS 6930 taught by Professor Staff during the Fall '08 term at University of Florida.

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eric_stego - Survey of steganography With an emphasis on...

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