Implementing an efficient encryption block for MPEG video streams

Considering the typically large data size and real time constraints of most multimedia contents, specially video, current encryption algorithms developed to secure text data are not applicable. Several video encryption methods have been proposed in the literature, but most methods are either too complicated for a real time hardware implementation, or are not secure enough. In this paper a new video cipher/decipher scheme for MPEG video streams has been proposed. The proposed architecture has been implemented in VHDL and tested with MPEG-4 streams. Simulation results indicate that the hardware implementation complexity of the proposed stream cipher is just %2 and %13 of the AES and TDES methods respectively. The computational complexity required to break the cipher is in the order of 2⁶³