A Fast and Fully Format Compliant Protection of JPEG2000 Code-Streams

Direct encryption for the JPEG2000 code-streams by using a conventional block cipher needs an additional processing time, whereas the joint compression and encryption schemes increase the coding efficiency but with some sacrifices in security. In this paper, a Dually Randomized MQ coder (DRMQ) is presented to support both compression and encryption functionalities, and to achieve tradeoff between security and efficiency. The proposed DRMQ coder avoids the permutations of input/output bits to enhance security. It makes use of a dual randomization to provide more protected results. Furthermore, we show that the DRMQ coder can be combined with a format compliant header encryption algorithm to achieve a fast and full protection of JPEG2000 code-streams. The experimental results confirm the efficiency and encryption performance of our scheme.