ABE is a encryption mode for one-to-multiple and can enable an ifne-grained access control mechanism over encrypted data ,which can be stored and shared on the Internet third websites and has been a hot research direction in recent years and developed rapidly. This paper introduces the basic principle of ABE and the classical algorithm about ciphertext-policy attribute-based encryption. At last, the paper discusses the application of ciphertext-policy attribute-based encryption in the of social networks.%属性加密是一种一对多的加密模式，能够对存储和共享在互联网第三方站点上加密后的敏感信息进行细粒度的访问控制，作为近年来密码学研究的一个热门方向，得到了快速发展。文章介绍了属性加密的基本原理及基于密文策略的属性加密经典算法。最后，论述了密文策略的属性加密在社交网络隐私保护中的应用。
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