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In this paper we investigate the applicability of different parts of the JPEG2000 codestream for authentication. Apart from the packet body different classes of information contained in the packet header are investigated. We report on experimental results obtained with a large test set of natural images to assess how discriminative and how sensitive each class of information is. Specific attacks against...
An encryption approach for H.264/AVC and SVC is proposed. Although the bitstream (format stream) is encrypted with state-of-the-art symmetric ciphers, H.264/AVC and SVC compliance is preserved. Standard compliant encoder/decoder and conventional symmetric ciphers, e.g., in specialized hardware, can still be employed - a significant advantage compared to previous work. The approach is suitable for...
Transparent encryption allows the decoding of a preview image from the encrypted bitstream, even if the key is not available. We propose a lightweight partial encryption scheme that allows transparent encryption for JPEG2000. The proposed scheme efficiently encrypts JPEG2000 packet header information. The resulting bitstream is fully format-compliant. Apart from low computational complexity, the proposed...
Baseline JPEG is not well suited for designing efficient encryption schemes. Selective encryption technology can be applied much better to visual data in scalable representation. We use the three progressive modes as defined in the JPEG extended system for providing confidentiality to visual data by encrypting selected scans. Whereas the hierarchical progressive and spectral selection modes turn out...
Vapour production through cavitation extracts heat from the fluid surrounding the cavity and creates a temperature difference between liquid and vapour. This thermal effect is particularly significant in cryogenic liquids. Estimates of the temperature difference can be made provided: (a) the rate of vapour production required to sustain a given cavity, and (b) and appropriate model for the heat exchange...
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