Abstract
The recording and playback system (RPS) in video conference system needs to store mass of media data real-timely. Considering the security issue, media data should be encrypted before storing. Traditional full encryption and partial encryption algorithms are not applicable to RPS because they could not adjust their speed to meet the throughput variation of media data in real-time RPS. In this paper, a novel lightweight speed-adaptive media-data encryption (SAME) scheme is proposed firstly. Secondly, the SAME is improved to a packet-based algorithm according to the implementation of data storage in RPS system. Thirdly, an RPS oriented queue theory-based autoadaptive speed control mechanism for SAME is designed. Finally, these schemes are integrated into the practical system, that is, AdmireRPS, an RPS of a heterogeneous wireless network-(HWN-) oriented video conference system. Theoretical analysis and experimental results show the SAME is effective enough to support real-time applications. In addition, the proposed schemes also can be used in video surveillance and other video recording systems.
Highlights
With the development of multimedia and network technologies, video conferences and some other streaming media systems have attracted significant research efforts [1,2,3,4,5,6,7,8]
We find that the software implementation of traditional encryption algorithm on universal processor is no more than 200 Mbps, which is inadequate to the data throughput of MediaGateway [7], RPServer, and other servers
A security scheme for Recording and playback system (RPS) system is designed and implemented, which is based on the speed-adaptive media-data encryption (SAME) algorithm
Summary
With the development of multimedia and network technologies, video conferences and some other streaming media systems have attracted significant research efforts [1,2,3,4,5,6,7,8]. How to maintain the security of media data becomes a challenge task [1, 8, 9] To solve this problem, a lot of multimedia (e.g., image, video, or audio) content encryption schemes have been proposed during the last decade. It needs the encryption process to parse the P- and B-frames, and is not suitable for RPS Another kind of partial encryption focuses on discrete cosine transform (DCT) coefficients, motion vector, and other sensitive data. Chen et al [2] proposed a mathematical model-based dynamic optimal selective control mechanism for optimizing the security of multidatastreams in video conference These schemes are designed based on the special needs of applications. In this paper, we design a secure real-time recording and playback system, named AdmireRPS, based on a novel Speed-Adaptive Media-Data Encryption (SAME).
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