Selective region encryption using a fast shape adaptive transform

Selective regional encryption was performed on nonrectangular, statistically relevant regions of image media by permutation of coefficients in the domain of a fast, shape adaptive, parametric transform in order to partially encrypt the original image. Regions were successfully segmented using a high order information analysis. A simple encryption scheme which exploits the energy compaction properties of a shape adaptive cosine transform was then applied in the transform domain. Computer simulation shows that the method is fast and statistically secure.