… authentication schemes. In contrast, this paper surveys research that is relevant to location
privacy in … can protect location privacy by reducing the number of queries needed for LBS. …

… system and subsequently discuss location privacy concerns, the … Afterwards, we identify the
objectives of location privacy … level of location privacy may require sacrificing service quality. …

… effective location privacy protection mechanism (LPPM) for LBSs without compromising the
quality of service. … In our proposed GCS, a querying user must be authenticated by the other …

… authentication of the server before making the payment is also necessary. Organization:
Section 2 describes the literature review of the location-based services … is compromised with the …

… requirements but achieving privacy protection at the client side is a non-trial problem. In …
location privacy preserving scheme using cryptographic approach. It can preserve users privacy …

… authentication security of the system and then design a new location privacy protection
mechanism based on the privacy … without compromising their privacy [16]. Another definition of …

… are: (1) use of pseudonymous authentication for privacypreserving user authentication, (2) …
Without loss of generality, we assume that POI data in the LBS server is updated every TPOI , …

… We assume that a register (authentication server) has location information and the subscription
related … services without compromising privacy’, in Proceedings of the 32nd International …

… location privacy, query content privacy, POI privacy and allows linking of query instances from
the same returning user without sacrificing … , location privacy, and authentication of the user…

… Once the anonymizer is compromised, it may put the user information in jeopardy. In this …
At the same time, the query authentication can guarantee the correctness of the query results. …