Showing papers by "Hai Yu published in 2013"
TL;DR: This paper analyzes the intrinsic features of the bit distributions, the high correlation among bit planes and other issues related to the bit information of an image, and proposes an expand-and-shrink strategy to shuffle the image with reconstructed permuting plane.
146 citations
TL;DR: A nonlinear traverse on the plain-image using dependent diffusion and reverse cat map is proposed to replace the traditional linear traverse performed in the confusion phase.
123 citations
TL;DR: Simulation results and extensive cryptanalysis justify that the proposed permutation-diffusion type image cipher with a chaotic orbit perturbing mechanism has a satisfactory security with a low computational complexity, which renders it a good candidate for real-time secure image storage and distribution applications.
Abstract: During the past decades, chaos-based permutation-diffusion type image cipher has been widely investigated to meet the increasing demand for real-time secure image transmission over public networks. However, the existing researches almost exclusively focus on the improvements of the permutation and diffusion methods independently, without consideration of cooperation between the two processes. In this paper, an improved permutation-diffusion type image cipher with a chaotic orbit perturbing mechanism is proposed. In the permutation stage, pixels in the plain image are shuffled with a pixel-swapping mechanism, and the pseudorandom locations are generated by chaotic logistic map iteration. Furthermore, a plain pixel related chaotic orbit perturbing mechanism is introduced. As a result, a tiny change in plain image will be spread out during the confusion process, and hence an effective diffusion effect is introduced. By using a reverse direction diffusion method, the introduced diffusion effect will be further diffused to the whole cipher image within one overall encryption round. Simulation results and extensive cryptanalysis justify that the proposed scheme has a satisfactory security with a low computational complexity, which renders it a good candidate for real-time secure image storage and distribution applications.
52 citations
TL;DR: A new integral sliding mode control strategy for high-speed networks operating in asynchronous transfer mode (ATM) is derived to cope with the congestion problem in network flow control and does achieve both of the main goals in ATM network traffic.
Abstract: A new integral sliding mode control strategy for high-speed networks operating in asynchronous transfer mode (ATM) is derived to cope with the congestion problem in network flow control. The novelty of the proposed design solution stem from allowing high-speed networks to have simultaneously acting multiple time-varying input delays, uncertainties and time-varying perturbations. A delay-dependent condition is derived via the linear matrix inequality approach that guarantees both the asymptotic stability and a prescribed H ∞-performance level of the closed-loop system in sliding mode dynamics when perturbations of available bit-rate bandwidth occur. These new results are obtained with no restriction on the derivative of the time-varying delays hence are less conservative than the existing ones. This control scheme does achieve both of the main goals in ATM network traffic, namely convergence of the queue length to the desired steady-state status and the weighted fairness condition. The application to bench...
10 citations
TL;DR: In this paper, the modified function projective synchronization of different dimensional fractional-order chaotic systems with known or unknown parameters is investigated, and the adaptive controllers with corresponding parameter update laws for achieving the synchronization are given.
Abstract: The modified function projective synchronization of different dimensional fractional-order chaotic systems with known or unknown parameters is investigated in this paper. Based on the stability theorem of linear fractional-order systems, the adaptive controllers with corresponding parameter update laws for achieving the synchronization are given. The fractional-order chaotic system and hyperchaotic system are applied to achieve synchronization in both reduced order and increased order. The corresponding numerical results coincide with theoretical analysis.
5 citations