图像置乱是实现图像加密的重要手段之一。由于混沌系统具有非周期性、遍历性、伪随机性和对初值的高度敏感性,因而已被广泛应用于图像置乱。为提升图像置乱效果和置乱性能,现提出了一种图像分块与混沌网相结合的图像置乱方法。该方法首先利用一种分块思想将图像进行置乱,进而构造一种混沌网,并将其应用于分块置乱的结果。实验结果表明,该方法不仅可取得良好的置乱效果,并具有较强的抗攻击性能。

Image scrambling is an available means for image encryption.Since chaos system is extremely sensitive for initial value,ergodic and aperiod,it was widely applied for image encryption.Because there are certain techniques to decode the encryption method based merely on chaos system,a novel scrambling method based on image blocking and chaos system is presented in this paper.The rough idea of this method is that an image is scrambled by a blocking method,and then the result is further scrambled by a modulating way provided by chaos system.The experimental result proves that the new method is effective.