Location Privacy Preserving Scheme Based on Attribute Encryption

There are only two modes,"public" or "private" to manage the user's location information in the social network. However, in some cases, users need to inform some people of their exact location, and the other people are only access to the inaccurate, maybe fuzzy location information. Therefore, we design a location privacy preserving scheme based on attribute encryption, which provides "precise", "more accurate", "fuzzy" and "private" four modes to manage the location information. The scheme based on the algorithm of WT-CP-ABE [1]. The location information is divided into three parts according to different ranks of intimacy, then we encrypt the key information and position information with attribute-based encryption and symmetric encryption respectively, and then issue the ciphertext to the social network. We analyze the security of the scheme, which shows that the scheme has the advantages of user attribute information confidentiality, data confidentiality and it can resist the collusion attack.