Shrinkwrap
| Autor: | Xi He, Jennie Rogers, Johes Bater, Ashwin Machanavajjhala, William Ehrich |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
SQL
Information retrieval Computer science Interface (Java) General Engineering InformationSystems_DATABASEMANAGEMENT 02 engineering and technology Padding Set (abstract data type) 020204 information systems 0202 electrical engineering electronic engineering information engineering Secure multi-party computation Differential privacy 020201 artificial intelligence & image processing Cardinality (SQL statements) Performance improvement computer computer.programming_language |
| Zdroj: | Proceedings of the VLDB Endowment. 12:307-320 |
| ISSN: | 2150-8097 |
| Popis: | A private data federation is a set of autonomous databases that share a unified query interface offering in-situ evaluation of SQL queries over the union of the sensitive data of its members. Owing to privacy concerns, these systems do not have a trusted data collector that can see all their data and their member databases cannot learn about individual records of other engines. Federations currently achieve this goal by evaluating queries obliviously using secure multiparty computation. This hides the intermediate result cardinality of each query operator by exhaustively padding it. With cascades of such operators, this padding accumulates to a blow-up in the output size of each operator and a proportional loss in query performance. Hence, existing private data federations do not scale well to complex SQL queries over large datasets. We introduce Shrinkwrap, a private data federation that offers data owners a differentially private view of the data held by others to improve their performance over oblivious query processing. Shrinkwrap uses computational differential privacy to minimize the padding of intermediate query results, achieving up to a 35X performance improvement over oblivious query processing. When the query needs differentially private output, Shrinkwrap provides a trade-off between result accuracy and query evaluation performance. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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