Cube-based encryption connected prior to motion JPEG standard

We propose a cube-based encryption-then-compression (ETC) system for the Motion JPEG standard. ETC systems reduce the visibility of multimedia content, such as a video sequence, to provide a high level of security at the same time as compressing it efficiently. The conventional ETC system for Motion JPEG applies block-based encryption to each frame of a sequence. However, although the quality of the encrypted and compressed frames is comparable to that of the unencrypted frames, any third party may decrypt the content from a frame without a decryption key because the blocks cannot be moved from one frame to another. To enhance the security of the ETC system, we propose a cube-based encryption by extending the block-based encryption. Experiments show that the proposed encryption method affects the Motion JPEG in quality, whereas that the level of encryption is high both objectively and subjectively.