Degradation and encryption for outsourced PNG images in cloud storage. (2016)

• Record Type: Journal Article
• Authors: Wang, Ying; Du, Jiali; Cheng, Xiaochun; Liu, Zheli; Lin, Kai
• Is Part Of: International journal of grid and utility computing. Volume 7:Number 1(2016)
• Page Start: 22
• Page End: 28
• Publication Date: 2016
• Subjects: image privacy -- format compliant encryption -- format preserving encryption -- cloud storage -- PNG images -- portable network graphics -- cryptography -- image degradation -- outsourcing -- cloud computing -- image security; Electronic data processing -- Distributed processing -- Periodicals; Electronic commerce -- Management -- Computer programs -- Periodicals; 004.605
• Languages: English
• ISSNs: 1741-847X

Abstract

In cloud storage environment, users frequently store images and retrieve them by personal device, including mobile phones. However, the content of outsourced images will be leaked to the cloud server, which is not trusted by users. To protect the privacy of sensitive images, this paper proposes format-compliant degradation and encryption method for Portable Network Graphics (PNG). More specifically, for PNG degradation, improved prefix method and noise generation methods are developed. Furthermore, for PNG encryption, a modified generalised-Feistel method is developed. Finally, our security analysis demonstrates that the proposed scheme is secure. Our experiment results also show that the scheme is efficient and practical.