5. The method according to claim 1 , wherein the determining the subspace of search includes searching the unencrypted index metadata for each sub-query to identify sub-query indexes, the sub-query indexes being encrypted indexes that meet the criteria of each associated sub-query.
5. The method according to claim 1 , wherein the determining the subspace of search includes searching the unencrypted index metadata for each sub-query to identify sub-query indexes, the sub-query indexes being encrypted indexes that meet the criteria of each associated sub-query. 6. The method according to claim 5 , wherein the identifying the sub-query indexes is with the second processor.