Abstract:

A new image encryption algorithm based on fivedimension hyperchaotic system was presented to solve the issues of network data security for global information grid.  The image encryption scheme based on hyperchaotic system for the communication system of global information grid was given. Two chaotic sequences were preprocessed to shuffle the positions of image pixel，and a chaotic sequence was selected and preprocessed for pixel value encryption of image to change the gray values. Simulation results and analysis show that the proposed encryption algorithm has the advantages of large key space, key selection sensitivity, high security and good encryption effect.

Key words: global information grid（GIG）, hyperchaotic system, image encryption