CAJ | 학술논문

基于位置的服务作为一种不断发展的新型服务模式，为人们的生活带来了极大的便利。但另一方面，用户的位置隐私也受到了很大的威胁。从LBS位置隐私保护的实际应用出发，根据现有的位置隐私保护模型，分析了在用户协作构建匿名域的方式下，用户非完全可信时，位置隐私面临的威胁，提出了User-Cooperation Security（UCA）匿名算法，在P2P空间匿名算法的基础上引入数字签名技术，实现用户之间的身份认证，并且在通信过程中，用接收方的私钥加密位置信息，避免了攻击者窃取他们的位置信息。算法中还加入了用户可以容忍的最大等待时间这一参数，通过等待一段时间重新进行节点发现，有效地提高了匿名成功率。通过实验验证，该算法可以更好地保护用户的位置隐私。
기우위치적복무작위일충불단발전적신형복무모식，위인문적생활대래료겁대적편리。단령일방면，용호적위치은사야수도료흔대적위협。종LBS위치은사보호적실제응용출발，근거현유적위치은사보호모형，분석료재용호협작구건닉명역적방식하，용호비완전가신시，위치은사면림적위협，제출료User-Cooperation Security（UCA）닉명산법，재P2P공간닉명산법적기출상인입수자첨명기술，실현용호지간적신빈인증，병차재통신과정중，용접수방적사약가밀위치신식，피면료공격자절취타문적위치신식。산법중환가입료용호가이용인적최대등대시간저일삼수，통과등대일단시간중신진행절점발현，유효지제고료닉명성공솔。통과실험험증，해산법가이경호지보호용호적위치은사。
As a new service model, location-based service brings people great convenience. But, users’location privacy is facing a lot of threat. According to the actual application on location privacy protection in LBS and the existing privacy protection model, the paper analyzes the threat when using the method based on users’cooperation to protect location pri-vacy and the users are not fully confidential, and proposes an algorithm called User-Cooperation Security(UCA)spatial algorithm. The algorithm introduces digital signature into the peer-to-peer spatial cloaking algorithm, so that users can realize the identity authentication with others and encrypt the sensitive messages with the private key of receiving party before they send them, avoiding the attackers stealing their position. Besides, the algorithm can discover more nodes when the users broadcast discovering messages again after a little time. Through the experiment, the algorithm is proved that it can protect users’location privacy better.