Titanium: A Metadata-Hiding File-Sharing System with Malicious Security
Titanium: A Metadata-Hiding File-Sharing System with Malicious Security
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DOI：
10.14722/ndss.2022.24161
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Weikeng Chen;Thang Hoang;J. Guajardo;A. Yavuz
中科院分区：
文献类型：
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作者：
Weikeng Chen;Thang Hoang;J. Guajardo;A. Yavuz
-端到端加密文件共享系统，用户共享文件时不会向存储服务器泄露文件内容。但是，服务器仍然学习元数据，包括用户身份和访问模式。先前的工作试图消除这种泄漏，但依赖于强有力的假设。Metal （NDSS ' 20）对恶意服务器不安全。MCORAM （ASIACRYPT ' 20）提供针对恶意服务器的机密性，但不提供完整性。Titanium是一个元数据隐藏文件共享系统，提供机密性和完整性，以防止恶意用户和服务器。与MCORAM提供针对恶意服务器的机密性相比，Titanium还提供完整性。实验表明，钛的速度比MCORAM快5 ~ 200倍。
—End-to-end encrypted file-sharing systems enable users to share files without revealing the file contents to the storage servers. However, the servers still learn metadata, including user identities and access patterns. Prior work tried to remove such leakage but relied on strong assumptions. Metal (NDSS ’20) is not secure against malicious servers. MCORAM (ASIACRYPT ’20) provides confidentiality against malicious servers, but not integrity. Titanium is a metadata-hiding file-sharing system that offers confidentiality and integrity against malicious users and servers. Compared with MCORAM, which offers confidentiality against malicious servers, Titanium also offers integrity. Experiments show that Titanium is 5 × to 200 × faster or more than MCORAM.