Titanium: A Metadata-Hiding File-Sharing System with Malicious Security

Weikeng Chen; Thang Hoang; Jorge Guajardo; Attila A.  Yavuz

Paper 2022/051

Titanium: A Metadata-Hiding File-Sharing System with Malicious Security

Weikeng Chen, Thang Hoang, Jorge Guajardo, and Attila A. Yavuz

Abstract

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 5x-200x faster or more than MCORAM.

Metadata

Available format(s): PDF
Category: Applications
Publication info: Published elsewhere. NDSS 2022
DOI: 10.14722/ndss.2022.24161
Keywords: oblivious RAM malicious security privacy integrity
Contact author(s): weikeng @ dzk org
History: 2022-01-18: received
Short URL: https://ia.cr/2022/051
License: CC BY

BibTeX

@misc{cryptoeprint:2022/051,
      author = {Weikeng Chen and Thang Hoang and Jorge Guajardo and Attila A.  Yavuz},
      title = {Titanium: A Metadata-Hiding File-Sharing System with Malicious Security},
      howpublished = {Cryptology {ePrint} Archive, Paper 2022/051},
      year = {2022},
      doi = {10.14722/ndss.2022.24161},
      url = {https://eprint.iacr.org/2022/051}
}