A New Approach to Partial Image Encryption

Abstract

The traffic of digital images and video has grown rapidly in the internet. Security becomes important for several applications like military image database, confidential video conferencing, medical images, etc. Several techniques have been developed for textual data but are not appropriate for images and video with huge amount of file size. In traditional image and video content protection schemes, called fully layered, the whole content is first compressed. Then, the compressed bitstream is entirely encrypted using a standard cipher. The specific characteristics of this kind of data make standard encryption algorithms inadequate. Partial encryption is a recent approach to reduce the encryption time of images in distributed network. Partial image encryption is used to reduce the amount of data to encrypt while achieving a sufficient and inexpensive security. The proposed approach involves two ways, the first is by pixel value manipulation and other second is by using SCAN mapping method. The PSNR comparison of proposed technique with the existing partial image encryption techniques shows that proposed technique gives better security than the existing techniques.