01-01-2013, 04:58 PM
Multimedia Encryption
Special application of general encryption to multimedia such that the content cannot be rendered intelligibly or to an acceptable perceptual quality.
Have a number of unique requirements and desirable features that a general cryptosystem lacks.
Different applications may have a different list of requirements and a different order of priorities.
Trade-off may be necessary
Applications
Confidential videoconferences
Confidential facsimile transmissions
Medical image transmission and storage
Streaming media
DVD content protection
Pay-TV
Digital transmission through IEEE 1394 interface
Characteristics of Multimedia Applications
Characteristics
High data rate
Power hungry
Real-time constraint
Continuous
Synchronous
Loss-tolerant
Prioritized components
Different values of content
Different security requirements
Different distribution channels
DVD, Satellite TV, Internet, wireless
Security Break of Multimedia Encryption
Complete break
Recover full plain bitstreamby finding the key etc,
Perceptual break
Render acceptable perceptual quality or recover certain content information without a key
Local break
Deduce a local plain bitstream/content information
Information deduction
Gain certain information, less severe break