Face is a typical region of interest of image.The face region hierarchical encryption based on the vision perceptual enhances the pertinence and flexibility of image encryption.A novel face region encryption algorithm of palette image is proposed by involving the palette encrypting and pixels position encrypting.Different keys are used to encrypt the palette and the pixels posi tion

and the hierarchical encryption of palette image is achieved.The first level(lightweight)encryption will keep part of the perceptual information of the original face region and could be used for fast identifying.The second level encryption will eliminate all the perceptual information and achieve a high level security.Further

by combining the public key cryptosystem

a two level secure image transmitting scheme is constructed.