Privacy-Preserving Lightweight Image Encryption in Mobile Cloud

Abstract

With the rapid development of mobile cloud, multimedia data like image is a major challenge to maintain security and privacy for mobile users. Encryption is one of the best solutions to protect data. However, traditional encryption algorithms are not suitable for images which they were proposed for text data. In this paper, we propose an image encryption technique called privacy-preserving lightweight image encryption (PPLiIE) to make an encryption in a simple way, suitable for images and to maintain privacy. PPLiIE algorithm proceeds with a three-step process to secure the image data in mobile before storing to the cloud. We implement in Python language and analyze our results with various file images to conclude that the encryption time of the PPLiIE is reduced to 50% approximately than the encryption time of AES. In addition, the measurement of key sensitivity and file with variation of chunk size have expressed superior performance of PPLiIE. Finally, we review various security attacks against PPLiIE to express the security level.