Abstract
The problem of securely outsourcing computation to an untrusted server gained momentum with the recent penetration of cloud computing services. The ultimate goal in this setting is to design efficient protocols that minimize the computational overhead of the clients and instead rely on the extended resources of the server. In this paper, we focus on the outsourced database search problem which is highly motivated in the context of delegatable computing since it offers storage alternatives for massive databases, that may contain confidential data. This functionality is described in two phases: (1) setup phase and (2) query phase. The main goal is to minimize the parties workload in the query phase so that it is proportional to the query size and its corresponding response.
We study whether a trusted setup or a random oracle are necessary for protocols with minimal interaction that meet the optimal communication and computation bounds in the query phase. We answer this question positively and demonstrate a lower bound on the communication or the computational overhead in this phase.
Carmit Hazay—Research partially supported by a grant from the Israel Ministry of Science and Technology (grant No. 3-10883), by the European Research Council under the ERC consolidators grant agreement n. 615172 (HIPS).
Hila Zarosim—The author is grateful to the Azrieli Foundation for the Azrieli Fellowship award.
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Notes
- 1.
We remark that the internal structure of the database is not important for our proofs.
- 2.
Our formalization considers the minimal leakage of the length of the queries responses, yet our proofs follow for any type of leakage as the preprocessed database is computed independently of that leakage.
- 3.
We prove that if the order of communication between the receiver and the sender/server is swapped then our lower bounds follow more easily. We further note that our lower bounds are not restricted to a minimal interaction between the server and the receiver.
- 4.
We note that when privacy is not considered, we prove that there exists a query for which our lower bounds hold. For private protocols this implies that these lower bounds hold for all queries or else some information about the query leaks.
- 5.
For this to be meaningful, we requite that the size of the sender’s state is strictly less than n. This is formalized by assuming the existence of two polynomials \(p_1(\cdot )\) and \(p_2(\cdot )\) such that \(n\le p_1(\kappa )\), \(s\le p_2(\kappa )\) and \(s\in o(n)\).
- 6.
Notably, our lower bounds also apply to settings where all type of collusion are allowed since this only strengthens the model.
- 7.
We emphasize that the infeasibility proof holds for any database of length n (regardless of its internal structure).
- 8.
Recall that s denotes the size of the sender’s state in the query phase and that \(s\in o(n)\).
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Hazay, C., Zarosim, H. (2016). The Feasibility of Outsourced Database Search in the Plain Model. In: Zikas, V., De Prisco, R. (eds) Security and Cryptography for Networks. SCN 2016. Lecture Notes in Computer Science(), vol 9841. Springer, Cham. https://doi.org/10.1007/978-3-319-44618-9_17
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