23-04-2012, 12:18 PM
Steganography
steganography.ppt (Size: 444.5 KB / Downloads: 59)
Overview
What is steganography?
Implementations
Detection
Defeating steganography
Conclusion
Questions
What is steganography?
The art of hiding information inside information
Since everyone can read, encoding text
in neutral sentences is doubtfully effective
Since everyone can read, encoding text
in neutral sentences is doubtfully effective
Since Everyone Can Read, Encoding Text
In Neutral Sentences Is Doubtfully Effective
What is it used for?
Hiding the fact that you are sending messages
Hiding several messages inside data
Digital watermarking
Kerckhoffs' principle
Secure with knowlegde of the system
Message can only be read with secret key
Hiding several messages
Deniable cryptography
Knowledge of encrypted data
No proof of how much information is stored
Rubberhose (http://www.rubberhose.org)
Digital watermarking
Not really hiding information
Important: not modificable
Uses the hiding-property of steganography
Recent: MPAA hides watermarks in movies