Simultaneous encryption and compression of digital images based on Secure-JPEG encoding

Abstract

Confidentiality and efficient bandwidth utilization requires compression and encryption of digital images. Both of these parameters are necessary for most communication systems. Encryption and compression done separately sometimes result in decreased performance or reduced reconstruction quality. The paper presents a simultaneous encryption and compression scheme for digital images. It modifies standard JPEG compression in a way to encrypt data during compression. The encryption steps are based on a JPEG compressible image encryption scheme. The proposed Secure-JPEG algorithm provides the benefits of encryption along with the ability to provide lossless compression. This scheme results in improved performance and better reconstruction quality than existing schemes utilizing the similar approach.