Abstract
Resource allocation for multimedia selective encryption and energy efficient transmission has not been fully investigated in literature for wireless sensor networks (WSNs). In this article, we propose a new cross-layer approach to optimize selectively encrypted image transmission quality in WSNs with strict energy constraint. A new selective image encryption approach favorable for unequal error protection (UEP) is proposed, which reduces encryption overhead considerably by controlling the structure of image bitstreams. Also, a novel cross-layer UEP scheme based on cipher-plain-text diversity is studied. In this UEP scheme, resources are unequally and optimally allocated in the encrypted bitstream structure, including data position information and magnitude value information. Simulation studies demonstrate that the proposed approach can simultaneously achieve improved image quality and assured energy efficiency with secure transmissions over WSNs.
Highlights
The constraints in computation, memory, and energy resources are well-known challenges to sensor network designs especially for multimedia transmission
Recently there has been a rapid increase of interest on wireless multimedia sensor networks (WMSN), many realistic difficulties are in the way of such advancement, including but not limited to data authentication, secret data protection, image transmission quality, and energy efficiency
This paper proposed a novel cross-layer unequal error protection (UEP) optimization approach for wireless image data delivery in sensor networks
Summary
The constraints in computation, memory, and energy resources are well-known challenges to sensor network designs especially for multimedia transmission. This paper proposes a cross-layer approach to deliver selectively encrypted images for minimal distortion with strict energy budget constraints. Tree-based selective encryption is proposed in [11], in which the tree structure information is ciphered; without the tree structure information, leaf and children nodes will be put to wrong position, and it is impossible to decode the whole image All of these aforementioned works focus on application layer and have not considered the delivery of encrypted images in time-varying wireless channels. In recent literature on UEP studies for multimedia delivery over wireless networks, most of them focus on rate-distortion or delay-distortion oriented optimization, where different protection levels are applied to different media stream layers. In this paper we systematically formulate energy efficient secure image transmission problem, which is significant different from previous layer-based UEP schemes in literature.
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