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This paper proposes a new block scrambling encryption scheme that enhancesthe security of encryption-then-compression (EtC) systems for JPEG images,which are used, for example, to securely transmit images through an untrustedchannel provider. The proposed method allows the use of a smaller block sizeand a larger number of blocks than the conventional ones. Moreover, imagesencrypted using proposed scheme include less color information due to the useof grayscale even when the original image has three color channels. Thesefeatures enhance security against various attacks such as jigsaw puzzle solverand brute-force attacks. The results of an experiment in which encrypted imageswere uploaded to and then downloaded from Twitter and Facebook demonstrated theeffectiveness of the proposed scheme for EtC systems.

Grayscale-based Block Scrambling Image Encryption for Social Networking Services