Selective Multimedia Data Encryption Based on Discrete Hyperchaotic S-Box Generation with Motion-Based Fragmentation

Abstract

Cloud computing has become the significant technology with rapid popularization offering many services with highly effective computation and large scale storage solutions. As the multimedia files are growing explosively, securely storing it for authorized access is the major task. Concentrating on video file storage in public cloud environment, security and privacy of those outsourced videos are major concerns. The semantic elements of the HEVC videos are extracted on the horizontal and vertical video fragments and Selective Encryption on those semantic elements of videos are done when the data owner uploads video for cloud storage. Modified AES is the proposed selective encryption scheme to protect the video by encrypting each fragments in cipher feedback (CFB) process mode. A dynamic, nonlinear 2D discrete hyperchaotic mapping based S-box generation is proposed to enhance the security level by providing good confusion, diffusion and scrambling. The performance analysis of generated S-box and experimental results shows that the proposed selective encryption highly resists attacks and encrypts with reduced time complexity.