A Jigsaw Puzzle Solver-based Attack on Block-wise Image Encryption for Privacy-preserving DNNs. (arXiv:2211.02369v1 [cs.CR])

Privacy-preserving deep neural networks (DNNs) have been proposed for
protecting data privacy in the cloud server. Although several encryption
schemes for visually protection have been proposed for privacy-preserving DNNs,
several attacks enable to restore visual information from encrypted images. On
the other hand, it has been confirmed that the block-wise image encryption
scheme which utilizes block and pixel shuffling is robust against several
attacks. In this paper, we propose a jigsaw puzzle solver-based attack to
restore visual information from encrypted …

attack block encryption jigsaw privacy puzzle