In some embodiments, an apparatus includes a memory and a processor. The processor is configured to receive an index file that associates a characteristic in a set of documents with a set of information associated with the characteristic in the set of documents. The processor is further configured to generate an index identifier associated with the index file and calculate a set of pseudorandom logical block identifiers associated with a set of storage locations of a database based on the index identifier. The processor is then configured to parse the index file into a set of index data portions and send a signal to the database to write each index data portion from the set of index data portions at a different storage location within the database as indicated by a different identifier from the set of pseudorandom logical block identifiers.