# Symmetric private information retrieval (Multi-server) Symmetric private information retrieval is a stronger version of [[Multi-server Private Information Retrieval]] that in addition to protecting the querier's privacy, also protects the data privacy. It was first introduced by [[GIKM00 - Protecting Data Privacy in Private Information Retrieval Scheme|GIKM00]], which showed how to construct it in the multi-server setting with information-theoretic security. ## Definition ### Variations - [[Symmetric private information retrieval (Single-server)]] ## Other results