In mobile network communication, image data usually needs to be transmitted and shared with multimedia data such as audio and video. Image data often contains personal information, such as photos,videos, etc. In order to ensure the security of network communication data effectively, a double chaotic data encryption algorithm is proposed based on the image data modified in large-scale mobile network communication.A new filling curve is used for global scrambling of image data in large-scale mobile network communication. An improved Joseph ergodic method is used to expand the bit-level scrambling of adjacent pixels, and bidirectional ciphertext feedback is introduced to realize the initial encryption of image data. Double chaos and Arnold transform are effectively combined. The initial state value is formed by using the key, which is used to control the double chaos system to form a series of chaos matrix, the position transformation and value change of image pixels are expanded as an aid, and each component of the image is expanded by Arnold transform. The set scramble-diffusion encryption algorithm is used to process the horizontal connected image, and finally the XOR ( exclusive OR) operation is performed on the image pixels to realize the security encryption of double chaos data in large-scale mobile network communication. Experimental results show that the proposed algorithm can obtain satisfactory encryption effect and has good plaintext sensitivity.

large-scale mobile network communication, double chaotic system, image data, secure encryption, Arnold transformation