21 March 2005 Efficient secure image transmission: compression integrated with encryption
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Due to the ease with which digital data can be manipulated and due to the ongoing advancements that have brought us closer to pervasive computing, the secure delivery of video and images has become a challenging problem. Despite the advantages and opportunities that digital video provide, yet, the illegal copying and distribution as well as plagiarism of digital audio, images, and video is still ongoing. In this paper we describe a technique for securing digital images based on combining image compression and encryption. The underlying idea in this is to combine encryption with rate scalable image compression such as EZW or SPIHT. EZW or SPIHT compresses image in such a way that the present coding state of a wavelet coefficient is dependent on the current coding of the coefficient’s parent and on prior coding states of the coefficient and its parent. A consequence of this within a bit stream of length N is that if we obscure the first M leading bits of the bit stream and leave the remaining N-M bits unchanged then the trailing N-M bits reveal “very little information” about the original image. Thus, by exploiting this inter-data dependency we can selectively encrypt part of the data stream and hence, reduce the computational burden and bandwidth requirement for transmitting images securely.
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Paul Salama, Paul Salama, Brian King, Brian King, } "Efficient secure image transmission: compression integrated with encryption", Proc. SPIE 5681, Security, Steganography, and Watermarking of Multimedia Contents VII, (21 March 2005); doi: 10.1117/12.587011; https://doi.org/10.1117/12.587011

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