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15 results on '"Lyu, Xin"'

6. A Trajectory Released Scheme for the Internet of Vehicles Based on Differential Privacy.

Author

Cai, Sujin, Lyu, Xin, Li, Xin, Ban, Duohan, and Zeng, Tao

Abstract

The locations and users’ information can be shared and interacted in the IoV (Internet of Vehicles), which provides sufficient data for traffic deployment and behavior pattern analysis. However, privacy issues had become more severe since personal or sensitive information is inclined to be revealed in a big data environment. In this work, a novel differential privacy-based algorithm named DPTD (Differentially Private Trajectory Database) is proposed for trajectory database releasing. Firstly, a 3-dimensional generalized trajectory dataset is established by considering the time factor. Then, the trajectory space is divided into several planes through the timestamps, and the set of the locations on each plane is further processed by clustering and generalizing to re-form new trajectories, that is, the trajectories to be released. This method is quite favorable to prefix-tree releasing because the spatiotemporal characteristics of the trajectories can be captured and spareness problem is fixed. Besides, a Markov assumption-based prediction method is suggested in order to reduce the cost of adding noise. Unlike the traditional method that the noise is added layer by layer, the noise is only added to the odd layers based on the prediction through spatio-temporal correlation, saving approximately 50% of the privacy budget. Theoretical analysis and experimental results show that the proposed algorithm has better data availability than the compared algorithms while guaranteeing the expected privacy level. [ABSTRACT FROM AUTHOR]

Published
2022
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10. A Quantitative Approach for Medical Imaging Device Security Assessment

Author

Qixu Liu, Zhuo Zihan, Xiali Hei, Jianyi Zhang, Xiaoxiang Zou, Zhiqiang Wang, Pingchuan Ma, and Lyu Xin

Subjects
03 medical and health sciences, Government, 0302 clinical medicine, Fuzzy analytic hierarchy process, Risk analysis (engineering), Computer science, Medical imaging, Security management, 030212 general & internal medicine, Security assessment, 030204 cardiovascular system & hematology
Abstract

Medical imaging devices play a fundamental role in e-health, and threats to them can endanger patients' privacy and safety. Government agencies in many countries have issued guidance for pre-and post-market security management. However, these methods suffer from bias and low efficiency. In this paper, we design a list of criteria and propose a Fuzzy Analytic Hierarchy Process-based model for fine-grained security assessment of medical imaging devices. Finally, a case study is presented to illustrate the steps involved in our model.

Published
2019

11. A Collaborative Location Querying Method Based on Caching Information

Author

Lyu Xin, Chenglong Li, Tao Zeng, and Chen Juan

Subjects
Service (systems architecture), Database, Point (typography), Computer science, Process (computing), 02 engineering and technology, Service provider, computer.software_genre, Broadcasting (networking), 020204 information systems, Server, Location-based service, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Cache, computer
Abstract

Location based services has brought great convenience to human life. The service providers have gathered a lot of location information, which contains users' privacy information. Considering the location privacy-preserving methods which are central server-based, users need to communicate with the central server frequently, making the risk of privacy leaking increased. Aiming at this point, a collaborative query method is proposed. This method is based on user historical cache information, and the collaboration process is carried out through neighbor broadcasting. The execution process of query service is efficient, and frequent communication with untrusted server during location query is avoided. Then, the risk of privacy leakage caused by untrusted servers is reduced in a great extent. The experimental results show that the method has high query efficiency.

Published
2018

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