Abstract

This paper proposes a compression cum encryption technique of video data for secure storage with lesser memory requirement, and/or transmission over public network with lesser traffic than the requirements with clear videos. Initially, a group of pictures (GOP) is used to form an accordion matrix and then DCT transformation is applied to each 8×8 block for generating DC and AC values. The DCs are only then encrypted using RC4 byte stream cipher and send the same to the receiver. The receiver similarly uses RC4 to extract the DC values on decryption and the output is used for the approximation of the corresponding AC values. A smoothing operation is then applied for reconstructing the accordion matrix, which is finally used to reconstruct input GOP. The proposed scheme has been simulated on different video images, and it has been found that expected performance is achieved.