Commune: Shared Ownership in an Agnostic Cloud
Abstract
Cloud storage platforms promise a convenient way for users to share files and engage in collaborations, yet they require all files to have a single owner who unilaterally makes access control decisions. Existing clouds are, thus, agnostic to shared ownership. This can be a significant limitation in many collaborations because, for example, one owner can delete files and revoke access without consulting the other collaborators. In this paper, we first formally define a notion of shared ownership within a file access control model. We then propose a solution, called Commune, to the problem of distributed enforcement of shared ownership in agnostic clouds, so that access grants require the support of an agreed threshold of owners. Commune can be used in existing clouds without modifications to the platforms. We analyze the security of our solution and evaluate its performance through an implementation integrated with Amazon S3.
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BibTex
@inproceedings{soriente2015commune,
author = {Soriente, Claudio and Karame, Ghassan O. and Ritzdorf, Hubert and Marinovic, Srdjan and Capkun, Srdjan},
title = {{Commune: Shared Ownership in an Agnostic Cloud}},
booktitle = {Proceedings of the 20th ACM Symposium on Access Control Models and Technologies SACMAT '15},
address = {Vienna, Austria},
year = 2015,
month = jun,
publisher = {Association for Computing Machinery},
doi = {10.1145/2752952.2752972},
url = {https://doi.org/10.1145/2752952.2752972}
}Research Collection: 20.500.11850/106467