Project B4

Privacy-Preserving Cloud Storage

Principal Investigators


Dominique Schröder

Geb. 16 4. OG, Room 16.4.14
90429 Nürnberg

+49 911 56854 9231
dominique.schroeder(Replace this parenthesis with the @ sign)fau.de

PhD Students

Manuel Reinert

E9 1 1.05
66123 Saarbrücken

+49 681 302 71921
+49 681 302 57365
reinert(Replace this parenthesis with the @ sign)cs.uni-saarland.de


Mark Simkin

E1 1 223.2
66117 Saarbrücken

+49 681 302 71918
simkin(Replace this parenthesis with the @ sign)ca.cs.uni-saarland.de

Project Summary

Cloud storage has rapidly gained a central role in digital user habitats. While this comes with tremendous benefits, it incurs privacy threats for data owners (information about whom is stored in the cloud, e.g. patients) as they have little control over the activities of data clients (who access information in the cloud, e.g. hospitals), and it incurs privacy threats for data owners and data clients alike as cloud storage providers can monitor sensitive information. How to allow fine-grained access control to (encrypted) cloud data while hiding the access patterns from the storage provider? How to support data clients without revealing individual data owners’ identities? What are possible trade-offs between efficiency and privacy? To address these questions, we will investigate privacy-preserving outsourced databases in the presence of multiple data owners and clients. We will formalize appropriate privacy notions, develop cryptographic primitives supporting these notions, and investigate the minimal cryptographic assumptions necessary to instantiate these primitives. Towards trade-offs, we will design cryptographic protocols with minimal communication complexity and weaker notions of privacy. We will build a framework for client access through evaluating dedicated functions on (encrypted) data. We will investigate the application of our techniques to the setting of public logs, where legal authorities request to read the data.

Role Within the Collaborative Research Center

cdB4

Open Positions

In the context of this project we are looking for two qualified PhD students with a track record in topics relevant to the project. If you are interested please send a letter of intent together with your short CV to the PIs of the project.