Destructive and Constructive Aspects of Wavelet Tree Shu ing Cryptotosystems for Image Transmission

The demand for online multimedia services is ever increasing. There is a need for bandwidth reduction (compression), while at the same time for increased security. Traditional cryptographic algorithms/systems for data security are often not fast enough to process the vast amounts of data generated by the multimedia applications to meet the real-time constraints. Selective encryption is a scheme that is often used for multimedia content protection. It involves encrypting only a portion of the data to reduce computational complexity(the amount of data to encrypt) while preserving a su cient level of security. A tool that is sometime used in a selective encryption scheme is Wavelet Tree Shu ing. We will show that Wavelet Tree shu ing when used with our mechanisms can construct a secure selective encryption scheme (constructive aspects), whereas when it is used as a single mechanism within a selective encryption scheme, the result can be insecure (destructive aspects).