A privacy protection mechanism based on information mixing is proposed. The principle of privacy-buddy mechanism is mixing private information in the entire social network, but not the encryption of private information, which allows private information to be spread in a ring-like way. The mechanism works in a decentralized way and does not need centralized trusted third-party server. Users protect their privacy through collaboration. A version of PB on renren.com as a Firefox extension is implemented. This version provides evidence for feasibility and availability of the core mechanism. Our mechanism can ensure the interests of multiple aspects: users demanding privacy protection, advertisers and authorized users or third-party applications requiring access to private information.%提出了一种基于信息混淆的社会网络隐私保护机制,其原理在于对整个社会网络里的隐私信息进行混淆,而非加密,使得需要保护的隐私信息以环形结构在社会网络里扩散开来.该机制以非集中化的方式工作,由用户之间的相互协作来保护用户的隐私信息.以“人人网”为平台,利用Fire fox的扩展开发功能实现了该隐私保护的核心机制,证明了其可行性与可用性.该机制能够保证多方面的利益:要求隐私保护的主体用户、广告商、经过授权的用户及第三方应用.
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