3Gao T G,Chen Z Q.A new image encryption aJ--gorithm based on hyper--chaos [J] .Physics Letters A 2008,372(4):394 400.
4Wang Y, Wong K W, Liao X F, et al. chaos-based image encryption algorithm with variable control parameters[J].Chaos, Solitons and Fractals 2009,41 (4): 1773 1783.