TPE-DF: Thumbnail Preserving Encryption via Dual-2DCS Fusion
Wenying Wen, Qiyu Jiang, Haigang Huang, Yushu Zhang, Yuming Fang
Abstract
Thumbnail preserving encryption (TPE) images protect privacy while still maintaining visual usability when stored in the cloud. However, existing thumbnail preserving encryption techniques are insufficient in defending against statistical attack. Drawing on the ideas of 2D compressed sensing (2DCS), this letter proposes thumbnail preserving encryption via dual-2DCS fusion, called TPE-DF, which can resist statistical attack. The original image is processed by 2DCS with deterministic binary block diagonal (DBBD) sampling matrix to generate the sampled image. Then, the residual matrix (RM) is then constructed by subtracting the predictive reconstructed values of the sampled image from the original image. The sampled image is processed by dual-2DCS fusion with arbitrary scaling sensing degradation (ASSD) matrix to obtain a carrier image. Then, the bitstream of RM is embedded in the carrier image to finally generate the TPE image. Experimental results show that a reversible TPE scheme with resistance to statistical attack is achieved.