A joint signal processing and cryptographic approach to multimedia encryption

TitleA joint signal processing and cryptographic approach to multimedia encryption
Publication TypeJournal Articles
Year of Publication2006
AuthorsMao Y, M. Wu
JournalImage Processing, IEEE Transactions on
Pagination2061 - 2075
Date Published2006/07//
ISBN Number1057-7149
Keywordsaccess control;approximation attacks;atomic encryption operations;bitrate overhead;content distribution;cryptographic approach;delegate processing;delegate service providers;generic data security;media security systems;multimedia content confidentiality;m, Computer-Assisted;, Computer-Assisted;Information Storage and Retrieval;Multimedia;Signal Processing

In recent years, there has been an increasing trend for multimedia applications to use delegate service providers for content distribution, archiving, search, and retrieval. These delegate services have brought new challenges to the protection of multimedia content confidentiality. This paper discusses the importance and feasibility of applying a joint signal processing and cryptographic approach to multimedia encryption, in order to address the access control issues unique to multimedia applications. We propose two atomic encryption operations that can preserve standard compliance and are friendly to delegate processing. Quantitative analysis for these operations is presented to demonstrate that a good tradeoff can be made between security and bitrate overhead. In assisting the design and evaluation of media security systems, we also propose a set of multimedia-oriented security scores to quantify the security against approximation attacks and to complement the existing notion of generic data security. Using video as an example, we present a systematic study on how to strategically integrate different atomic operations to build a video encryption system. The resulting system can provide superior performance over both generic encryption and its simple adaptation to video in terms of a joint consideration of security, bitrate overhead, and friendliness to delegate processing.