A privacy preserving friend discovery strategy using proxy re-encryption in mobile social networks

Abstract

In mobile social networks, based on secret sharing and CPABE, focusing on the security and privacy issues of friend discovery, we propose a matching scheme under different authorities and realize cross domain data access and sharing. By using proxy re-encryption technology, we hide users’ access policy, which can guarantee the security and privacy in the friend making process. Because agents attend encryption and decryption, the privacy can be largely enhanced and the bottleneck of single authority also will be solved. Security and performance analysis show that the relationship of ciphertext’s size and access policy is linear, which can resist collusion attack and meet CPA security, our scheme is superior to the existing schemes.