支持多授权中心的移动社交网络朋友发现方案

Friends Discovery Scheme Supporting Multi-authority Centers in Mobile Social Networks

社交网络的朋友发现机制容易导致用户隐私泄漏。为使用户得到良好的在线社交体验并确保其隐私数据安全,利用属性基加密和代理重加密技术,提出一种支持多授权中心与隐私保护的移动社交网络朋友发现方案。用户属性私钥由多个授权中心联合分发,以解决单授权机构的性能瓶颈问题。借助解密外包和固定密文加密技术减少用户的计算时间和存储开销。在此基础上,引入线性秘密共享矩阵,从而进行灵活的资源访问控制。分析结果表明,与已有的同类方案相比,该方案具有较低的计算复杂度和较灵活的用户撤销机制。

The friends discovery mechanism of social network is easy to lead to user privacy leaks. For users to get good online social experience and ensure the security of users＇ privacy data,using attribute-based encryption and agent re encryption technology,a mobile social network friends discovery scheme that supports multi-authority centers and privacy protection is proposed. User attribute private key is distributed by multi-authority centers to solve the performance bottleneck problem of single authority. With the help of decryption outsourcing and fixed ciphertext encryption technology,the computation time and storage cost of users are reduced. The linear secret sharing matrix is introduced and flexible resource access control strategy can be implemented. Analysis results show that the scheme has lower computational complexity and better user revocation mechanism compared with existing similar schemes.