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Image Encryption with Space-filling Curves

Suresh, V and Madhavan, Veni CE (2012) Image Encryption with Space-filling Curves. In: Defence Science Journal, 62 (1). pp. 46-50.

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Conventional encryption techniques are usually applicable for text data and often unsuited for encrypting multimedia objects for two reasons. Firstly, the huge sizes associated with multimedia objects make conventional encryption computationally costly. Secondly, multimedia objects come with massive redundancies which are useful in avoiding encryption of the objects in their entirety. Hence a class of encryption techniques devoted to encrypting multimedia objects like images have been developed. These techniques make use of the fact that the data comprising multimedia objects like images could in general be seggregated into two disjoint components, namely salient and non-salient. While the former component contributes to the perceptual quality of the object, the latter only adds minor details to it. In the context of images, the salient component is often much smaller in size than the non-salient component. Encryption effort is considerably reduced if only the salient component is encrypted while leaving the other component unencrypted. A key challenge is to find means to achieve a desirable seggregation so that the unencrypted component does not reveal any information about the object itself. In this study, an image encryption approach that uses fractal structures known as space-filling curves- in order to reduce the encryption overload is presented. In addition, the approach also enables a high quality lossy compression of images.

Item Type: Journal Article
Publication: Defence Science Journal
Publisher: Defence Research & Development Organisation, India
Additional Information: Copyright of this article is belongs to Defence Research & Development Organisation, India.
Keywords: Space-filling curves;partial encryption;light-weight encryption;lossy compression
Department/Centre: Division of Electrical Sciences > Computer Science & Automation
Date Deposited: 16 Mar 2012 11:06
Last Modified: 16 Mar 2012 11:09
URI: http://eprints.iisc.ac.in/id/eprint/44028

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