Partitioned information storage systems with controlled retrieval

摘要: An information storage system includes one or more update terminals, a mapper, partial-databases, and query exchanging messages over set of communication channels. identifier-mapping mechanism provides (to an terminal) method for delegating control retrieval the data stored at partial-databases to mappers, typically operated by trusted third parties. Update terminals supply information, that is in fragmented form partial-databases. Data-fragment identifiers pseudonyms are introduced, preventing unauthorized de-fragmentation information--thus providing compliance privacy legislation--while same time allowing retrieve (part of) learn properties data. The mapper necessarily involved both operations, access policies be enforced potential abuse reduced. Introduction multiple mappers acts distribute among Introducing so-called `groupers` increases efficiency common queries further reduces information.