Location-based Services, or LBS refers to value-added service by processing information utilizing mobile user location. For this kind of LBS, the role of security service is very important in the LBS that store and manage the location information of mobile devices and support various application services using those location information. And in all phases of these functions that include acquisition of location information, storage and management of location information, user management including authentication and information security, and management of the large-capacity location information database, safe security service must be provided. This paper describes a novel security approach to open LBS to validate certificates based on the current LBS environment using the web services security mechanism, presents a location-based platform that can block information leak and provide safe LBS, and analyzes authentication and security service between service systems and presents relevant application methods.