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  1. No Access

    Article

    Chosen-plaintext attack of an image encryption scheme based on modified permutation–diffusion structure

    Since the first appearance in Fridrich’s design, the usage of permutation–diffusion structure for designing digital image cryptosystem has been receiving increasing research attention in the field of chaos-bas...

    Yuansheng Liu, Leo Yu Zhang, Jia Wang, Yushu Zhang, Kwok-wo Wong in Nonlinear Dynamics (2016)

  2. No Access

    Article

    An image encryption scheme based on time-delay and hyperchaotic system

    In this paper, a novel image encryption scheme based on time-delay and hyperchaotic system is suggested. The time-delay phenomenon is commonly observed in daily life and is incorporated in the generation of ps...

    Guodong Ye, Kwok-Wo Wong in Nonlinear Dynamics (2013)

  3. No Access

    Article

    Breaking a novel colour image encryption algorithm based on chaos

    Recently, a colour image encryption algorithm based on chaos was proposed by cascading two position permutation operations and one substitution operation, which are all determined by some pseudo-random number ...

    Chengqing Li, Leo Yu Zhang, Rong Ou, Kwok-Wo Wong, Shi Shu in Nonlinear Dynamics (2012)

  4. No Access

    Article

    An efficient chaotic image encryption algorithm based on a generalized Arnold map

    An efficient image encryption algorithm using the generalized Arnold map is proposed. The algorithm is composed of two stages, i.e., permutation and diffusion. First, a total circular function, rather than the...

    Guodong Ye, Kwok-Wo Wong in Nonlinear Dynamics (2012)

  5. No Access

    Article

    Hopf Bifurcation on a Two-Neuron System with Distributed Delays: A Frequency Domain Approach

    In this paper, a more general two-neuron model with distributed delays and weak kernel is investigated. By applying the frequency domain approach and analyzing the associated characteristic equation, the exist...

    **aofeng Liao, Shaowen Li, Kwok-wo Wong in Nonlinear Dynamics (2003)

  6. No Access

    Article

    Hopf Bifurcation and Stability of Periodic Solutions for van der Pol Equation with Distributed Delay

    The van der Pol equation with a distributed time delay is analyzed. Itslinear stability is investigated by employing the Routh–Hurwitzcriteria. Moreover, the local asymptotic stability conditions are alsoderiv...

    **aofeng Liao, Kwok-wo Wong, Zhongfu Wu in Nonlinear Dynamics (2001)