Abstract
An asymmetric color image encryption scheme is proposed based on four-wing hyper chaotic complex system, whose initial values, parameter and step length depend on 512-bit hash value of the plain image. The encryption process is to transform three color components of red, green and blue into three 1D arrays, and then use three pairs of chaotic sequences to encrypt the elements of odd number and even number indexes respectively. The encryption algorithm and the decryption algorithm have different keys. Numerical results and security analysis demonstrate the feasibility and effectiveness of the asymmetric color image encryption scheme.
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