Multimedia encryption with joint randomized entropy coding and rotation in partitioned bitstream

Authors:
Dahua Xie;C.-C. Jay Kuo
Affiliations:
Ming Hsieh Department of Electrical Engineering and Integrated Media Systems Center, University of Southern California, Los Angeles, CA;Ming Hsieh Department of Electrical Engineering and Integrated Media Systems Center, University of Southern California, Los Angeles, CA
Venue:
EURASIP Journal on Information Security
Year:
2007

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Abstract

This work investigates the problem of efficient multimedia data encryption. A novel methodology is proposed to achieve encryption by controlling certain operations in the data compression process using a secret key. The new encryption approach consists of two cascaded modules. The first one is called randomized entropy coding (REC) while the second one is called rotation in partitioned bitstream (RPB). By leveraging the structure of the entropy coder, the joint REC/RPB encryption scheme incurs extremely low computational and implementation costs. Security analysis shows that the proposed scheme can withstand the ciphertext-only attack as well as the known/chosen plaintext attack. The efficiency and security of the proposed encryption scheme makes it an ideal choice in secure media applications where a large amount of multimedia data has to be encrypted/decrypted in real time.