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Secure keyword search in shared infrastructures prevents stored documents from leaking sensitive information to unauthorized users. A shared index provides confidentiality if it is exclusively used by users authorized to search all the indexed documents. We introduce the Lethe indexing workflow to improve query and update efficiency in secure keyword search. The Lethe workflow clusters together documents with similar sets of authorized users, and creates shared indices for configurable documentdoi:10.1109/bigdata.congress.2014.54 dblp:conf/bigdata/MicheliMA14 fatcat:r5mpmornrbdg3ltrvz2r2gvoiu