Abstract
Due to pervasive communication infrastructures, a plethora of enabling technologies is being developed over mobile and wired networks. Among these, video streaming services over IP are the most challenging in terms of quality, real-time requirements and security. In this paper, we propose a novel scheme to efficiently secure variable length coded (VLC) multimedia bit streams, such as H.264. It is based on code word error diffusion and variable size segment shuffling. The codeword diffusion and the shuffling mechanisms are based on random operations from a secure and computationally efficient chaos-based pseudo-random number generator. The proposed scheme is ubiquitous to the end users and can be deployed at any node in the network. It provides different levels of security, with encrypted data volume fluctuating between 5.5–17%. It works on the compressed bit stream without requiring any decoding. It provides excellent encryption speeds on different platforms, including mobile devices. It is 200% faster and 150% more power efficient when compared with AES software-based full encryption schemes. Regarding security, the scheme is robust to well-known attacks in the literature, such as brute force and known/chosen plain text attacks.
Highlights
Due to recent developments in the field of multimedia communications, applications, such as voice over IP (VoIP), video conferencing, e-learning and digital TV/HDTV, are part of everyday life
The problem of security for mobile communications is further exacerbated by the limited processing power and battery life available in diverse devices, handheld or mobile, for which provisioning of security may be infeasible when the complexity of related decoding operations is over the processing limit of such devices
We propose the flipping of at least one bit every BF = f · average Huffman codeword size (Av) · M EP L bits, where Av is the average size of Huffman codes, M EP L is the calculated mean average propagation length (MEPL) in codeword units, Av · M EP L is the average error propagation in bits, and f is a tunable security factor with values 1/(M EP L) ≤ f ≤ 1
Summary
Due to recent developments in the field of multimedia communications, applications, such as voice over IP (VoIP), video conferencing, e-learning and digital TV/HDTV, are part of everyday life. We are immersed in a worldwide information network where people do business online and have access to news, bank accounts, etc., from their offices or homes. These digital commodities have some inherent risks; communication networks (wired/wireless) are vulnerable to attacks violating the user’s right of privacy. The problem of security for mobile communications is further exacerbated by the limited processing power and battery life available in diverse devices, handheld or mobile, for which provisioning of security may be infeasible when the complexity of related decoding operations is over the processing limit of such devices. Security solutions have to be power efficient to allow longer and a greater number of sessions between mobile users within a single battery charging cycle. Any solution involving full encryption of the information limits itself in terms of scalability
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