Abstract: This paper proposes a new image parallel encryption algorithm aiming at the defects of some traditional image serial encryption algorithms, such as low security and long encryption time. First, the initial information of the plain image is set as an input signal of a parallel quantization scheme to generate a quantized decimal. Then the chaotic scrambling and diffusion matrix based on the chaotic system is designed, and the image data is encrypted in parallel by the confusion and diffusion structure. The algorithm is verified and implemented on the GPU of the iOS handheld device through the Metal parallel framework. The test results show that the scheme can effectively improves the image encryption efficiency, and has a high degree of sensitivity to the plaintext, which is suitable for the secure real-time communication of image data, and provides a new scheme for parallel processing of image data through the GPU.

Key words: image information security, iOS handheld devices, GPU, security