Andreas Pommer

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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.
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)
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