11. The system of claim 10 : wherein the file TO layer encrypts all terms of the individual search index file as a single contiguous block including the customer data at rest as stored on disk within the individual search index file to reduce vulnerability of the customer data to frequency based attacks and/or reconstruction of the customer data from the search index.
10. The system of claim 9 , wherein the individual search index file is divided into blocks and further wherein the blocks are divided into sub-blocks within which the customer data of the individual search index file and the non-customer data of the search index do not share any same sub-block.