ABnews: A Fast Private Social Messaging System Using Untrusted Storage and Attribute-Based Encryption
ABnews: A Fast Private Social Messaging System Using Untrusted Storage and Attribute-Based Encryption
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DOI：
10.1109/pst.2017.00045
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发表时间：
2017-08
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影响因子：
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通讯作者：
Yasushi Shinjo;Sota Naito;Kunyao Xiao;Akira Sato
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文献类型：
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作者：
Yasushi Shinjo;Sota Naito;Kunyao Xiao;Akira Sato
集中式社交网络服务（sns）或在线社交网络（osn）本身就存在隐私问题。在集中式和分布式系统中，基于密文策略属性的加密（CP-ABE）是一种有效且有前途的隐私保护工具。然而，使用CP-ABE开发新的实际社会应用需要付出很大的努力。此外，由于ABE需要大量的计算时间，这类应用程序经常存在性能问题。本文描述了ABnews系统的设计和实现，ABnews是一个使用ABE和非可信存储的类似usenet的社交消息传递系统。ABnews之所以速度快，是因为它消除了ABE在交互访问消息时的繁重计算。ABnews继承了Usenet的应用程序，并允许使用Usenet丰富的新闻阅读器而无需任何修改。此外，ABnews还提供了覆盖的社交应用程序，包括私人博客服务、在线服务和一对一的直接消息传递，这些都位于公告板系统之上。ABnews系统是使用功能工具包和谷歌驱动器实现的，谷歌驱动器保存加密消息。实验结果表明，在当前云存储服务上实现这样的消息传递系统时，CP-ABE的开销可以忽略不计。
Centralized social networking services (SNSs) or online social networks (OSNs) inherently have privacy concerns. Ciphertext-policy attribute-based encryption (CP-ABE) is an effective and promising tool for protecting privacy in centralized and distributed systems. However, a large effort is required to develop new practical social applications using CP-ABE. Furthermore, such applications often have performance problems because of the substantial computation time needed for ABE. This paper describes the design and implementation of the ABnews system, a Usenet-like social messaging system using ABE and untrusted storage. ABnews is fast because it eliminates the heavy computation of ABE from the interactive access to messages. ABnews inherits application programs from Usenet, and allows Usenet's rich newsreaders to be utilized without any modification. Furthermore, ABnews provides overlay social applications, including a private blogging service, a presence service, and one-to-one direct messaging, on top of bulletin board systems. The ABnews system has been implemented using the cpabe toolkit and Google Drive, which holds encrypted messages. Experimental results show that the overhead of CP-ABE is negligible when implementing such a messaging system on a current cloud storage service.