Selective Encryption provides the ability to strike a balance between security and processing demands, e.g. in mobile clients. Image encoding using wavelets and especially wavelet packets can be used for efficient selective encryption. We will show how two such methods work, and discuss their advantages and disadvantages in terms of security and speed.
The goals of Kluwer International Series on ADVANCES IN INFORMATION SECURITY are‚ one‚ to establish the state of the art of‚ and set the course for future research in information security and‚ two‚ to serve as a central reference source for advanced and timely topics in information security research and development. The scope of this series includes all… (More)
We discuss computationally efficient techniques for confidential storage and transmission of medical image data. Two types of partial encryption techniques based on AES are proposed. The first encrypts a subset of bitplanes of plain image data whereas the second encrypts parts of the JPEG2000 bitstream. We find that encrypting between 20% and 50% of the… (More)
Selective encryption is used to encrypt parts of a bitstream, in our case images which are compressed by a wavelet based method. One approach is to keep the filter secret which is used for the transformation. Parameterised wavelet filters can be used to generate a large keyspace, however, in the case of orthogonal filters obtained by a variant of Pollen's… (More)
In this paper we introduce and analyze diier-ent algorithms for fractal image compression on massively parallel SIMD arrays. Experimental results achieved on a MasPar MP-2 are included.