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Motivated by the problem of simultaneously preserving confidentiality andusability of data outsourced to third-party clouds, we present two differentdatabase encryption schemes that largely hide data but reveal enoughinformation to support a wide-range of relational queries. We provide asecurity definition for database encryption that captures confidentiality basedon a notion of equivalence of databases from the adversary's perspective. As aspecific application, we adapt an existing algorithm for finding violations ofprivacy policies to run on logs encrypted under our schemes and observe low tomoderate overheads.

Equivalence-based Security for Querying Encrypted Databases: Theory and Application to Privacy Policy Audits