Week 10 Patent Analysis

      Technology

      Oblivious RAM (ORAM) software prevents attackers from determining which files (or portions of files) the client is accessing by concealing a client's access patterns to data residing in a cloud        environment.

      Elements & claims

       1. A method of concealing access patterns to electronic data storage, the method comprising:

(a) within at least one server device configured for providing data storage services to at least one client, securely partitioning electronic data storage having N data blocks, each data block having a size of B bytes;

(b) wherein said electronic data storage is partitioned within a partitioning framework into a plurality of P smaller electronic data storage partitions having a size of N/P, and in which P is equal to √N data blocks;

(c) performing electronic data storage access concealment, in which each block is randomly assigned to any of the P partitions, and whenever a data block is accessed during data accesses for reading a data block or writing a data block by the client, the data block is logically removed from its current partition and logically assigned to a fresh random partition selected from all P partitions, with the client tracking which partition each block is associated with at any point of time; and (d) encrypting data by the client when data blocks are stored on the server; (e) wherein the client repeatedly sorts and shuffles subsets of said data blocks in each partition during data accesses.

21. A system for concealing access patterns to electronic data storage, the system comprising:

(a) at least one server configured for servicing at least one client with data storage services;

(b) at least one client configured for accessing said server for performing write and read accesses of data blocks from said server;

(c) wherein said server and said client are configured with a computer for executing programming for carrying out steps of access concealment, comprising:

(i) securely partitioning electronic data storage in said at least one server to have N data blocks having a size of B bytes;

(ii) wherein said electronic data storage is partitioned within a partitioning framework into a plurality of P smaller electronic data storage partitions having a size of N/P, and in which P is equal to equal to √N data blocks;

(iii) performing electronic data storage access concealment, in which each block is randomly assigned to any of the P partitions, and whenever a data block is accessed during data accesses for reading a data block or writing a data block by said client, the data block is logically removed from its current partition and logically assigned to a fresh random partition selected from all P partitions, with the client tracking which partition each block is associated with at any point of time; and

(iv) encrypting data by the client when data blocks are stored on the server;

(v) wherein the client repeatedly sorts and shuffles subsets of said data blocks in each partition during data accesses

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