CAJ | 학술논문

针对基于位置的服务位置隐私保护系统中可信第三方匿名服务器易受攻击的架构弊端以及用户间合作稳定性因时空变化而无法保证的问题，在无可信第三方、非合作模式下，提出一种自适应情境的位置隐私保护方法。通过服务器端构建多粒度抽象路网与位置情境模型，解决终端实时位置情境信息感知的通信问题；同时，根据终端用户的个性化通信成本与位置隐私保护强度设置，实现查询点与查询区域的自适应选取。实验结果表明，该方法实现了隐私保护度与通信开销、计算开销的平衡。
침대기우위치적복무위치은사보호계통중가신제삼방닉명복무기역수공격적가구폐단이급용호간합작은정성인시공변화이무법보증적문제，재무가신제삼방、비합작모식하，제출일충자괄응정경적위치은사보호방법。통과복무기단구건다립도추상로망여위치정경모형，해결종단실시위치정경신식감지적통신문제；동시，근거종단용호적개성화통신성본여위치은사보호강도설치，실현사순점여사순구역적자괄응선취。실험결과표명，해방법실현료은사보호도여통신개소、계산개소적평형。
Most current privacy-preserving techniques either require a trusted third-party ( TTP ) anonymizer or have proved to be quivering in the users' cooperative stability when temporal-spatial scenes change in located-based service ( LBS ) . In order to address these challenges , this paper introduces an adaptive context-aware privacy-preserving technique without TTP and user cooperation : the context of a user's location can be real-time achieved based on the multi-granularity abstract road-networks from the LBS server . Furthermore , the usage of the context-aware technique ensures adaptability to the user's personalized privacy settings , and enables the LBS server to retrieve the minimal regional road-network and incremental nearest-neighbor results . Theoretical analysis and experimental results validate the technique's effectiveness on LBS accuracy , privacy protection and communication QoS ( Quality -of-Service) .