Aiming at present situation that digital image encryption algorithms mostly adopt a low dimensional chaotic system

the key space is small and sequence complexity is not high enough

thus the encryption system is not so secure

propose a new encryption algorithm for color image based on hyperchaotic systems.Firstly

separate the RGB three basic colors from the original color image.Secondly

scramble pixels position using Lorenz chaotic sequences.Then

diffuse pixels value using the final key sequence diffusion pixel value generated by Chen hyperchaotic sequences which is related to plaintext

which make the algorithm sensitive to plaintext.Performance test and security analysis are performed on key space

pixels distribution character

correlation coefficients

the ability to resist differential attack and key sensitivity test.Results show that the proposed algorithm is secure and high efficient

and has huge application potential in image secure communication.