Multimedia Data Aggregation implementation in NS2

Privacy and Quality Preserving Multimedia Data Aggregation for Participatory Sensing Systems

Introduction:

                     Abstract—With the popularity of mobile wireless devices equipped with various kinds of sensing abilities, a new service paradigm named participatory sensing has emerged to provide users with brand new life experience. However, the wide application of participatory sensing has its own challenges, among which privacy and multimedia data quality preservations are two critical problems. Unfortunately, none of the existing work has fully solved the problem of privacy and quality preserving participatory sensing with multimedia data. In this paper, we propose SLICER, which is the first k-anonymous privacy preserving scheme for participatory sensing with multimedia data. SLICER integrates a data coding technique and message transfer strategies, to achieve strong protection of participants’ privacy, while maintaining high data quality. Specifically, we study two kinds of data transfer strategies, namely transfer on meet up (TMU) and minimal cost transfer (MCT). For MCT, we propose two different but complimentary algorithms, including an approximation algorithm and a heuristic algorithm, subject to different strengths of the requirement. Furthermore, we have implemented SLICER and evaluated its performance using publicly released taxi traces. Our evaluation results show that SLICER achieves high data quality, with low computation and communication overhead.

Implementation screen shots:

CONCLUSION AND FUTURE WORK

In this paper, we have presented a coding-based privacy preserving scheme, namely SLICER, which is a k-anony-mous privacy preserving scheme for participatory sensing with multimedia data. SLICER integrates the technique of erasure coding and well designed slice transfer strategies, to achieve strong protection of participants’ private information as well as high data quality and loss tolerance, with low computation and communication overhead. We have studied two kinds of data transfer strategies, including TMU and MCT. While TMU is a simple and straightforward 

strategy, MCT contains two complimentary algorithms, including an approximation algorithm and a heuristic algorithm, designed for satisfying different levels of delivery guarantee. We also implement SLICER and evaluate its performance using publicly released taxi traces. Our evaluation 

results confirm that SLICER achieves high data quality,strong robustness, with low computation and communication overhead.