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PRECISE: Identity-based private data sharing with conditional proxy re-encryption in online social networks

机译：精确：在线社交网络中基于身份的私有数据共享和条件代理重新加密

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摘要

Online social networks (OSNs) have become popular around the world due to its openness. Although cryptographic techniques can provide privacy protection for users in OSNs, several issues also remain problematic, such as fine-grained access control, efficiency and usability. In this paper, we propose PRECISE, an identity-based private data sharing scheme in OSNs with big data, in which the data owner could broadcast private data to a group of users at one time in a convenient and secure way. In order to achieve secure and fine-grained data disseminating in OSNs, we adopt attribute-based conditional proxy re-encryption to guarantee that only the data disseminators whose attributes satisfy access policy can disseminate the data to their own social space. The re-encryption key is associated with a set of attributes such that only the matched ciphertexts can be re-encrypted, which allows data owner to enforce access control over the disseminated ciphertexts in a fine-grained manner. The secure and performance analysis shows our scheme is secure and efficient.
机译：在线社交网络（OSN）由于其开放性而在世界范围内变得越来越流行。尽管加密技术可以为OSN中的用户提供隐私保护，但仍然存在一些问题，例如细粒度的访问控制，效率和可用性。在本文中，我们提出了PRECISE，这是大数据OSN中基于身份的私有数据共享方案，其中数据所有者可以方便，安全地一次将私有数据广播到一组用户。为了在OSN中实现安全且细粒度的数据分发，我们采用基于属性的条件代理重新加密，以确保只有属性满足访问策略的数据分发器才能将数据分发到自己的社交空间。重新加密密钥与一组属性相关联，因此只有匹配的密文可以被重新加密，这允许数据所有者以细粒度的方式对已分发的密文实施访问控制。安全性和性能分析表明我们的方案是安全高效的。

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