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An encryption scheme of JPEG images in the bitstream domain is proposed. Theproposed scheme preserves the JPEG format even after encrypting the images, andthe file size of encrypted images is the exact same as that of the originalJPEG images. Several methods for encrypting JPEG images in the bitstream domainhave been proposed. However, since some marker codes are generated or lost inthe encryption process, the file size of JPEG bitstreams is generally changeddue to the encryption operations. The proposed method inputs JPEG bitstreamsand selectively encrypts the additional bit components of the Huffman code inthe bitstreams. This feature allows us to have encrypted images with the samedata size as that recoded in the image transmission process, when JPEG imagesare replaced with the encrypted ones by the hooking, so that the imagetransmission are successfully carried out after the hooking.

Bitstream-Based JPEG Image Encryption with File-Size Preserving