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US Patent 7043637 - On-disk file format for a serverless distributed file system
US Patent Issued on May 9, 2006
Estimated Patent Expiration Date:
March 21, 2021Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
March 21, 2021Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA file format for a serverless distributed file system is composed of two parts: a primary data stream and a metadata stream. The data stream contains a file that is divided into multiple blocks. Each block is encrypted using a hash of the block as the encryption key. The metadata stream contains a header, a structure for indexing the encrypted blocks in the primary data stream, and some user information. The indexing structure defines leaf nodes for each of the blocks. Each leaf node consists of an access value used for decryption of the associated block and a verification value used to verify the encrypted block independently of other blocks. In one implementation, the access value is formed by hashing the file block and encrypting the resultant hash value using a randomly generated key. The key is then encrypted using the user's key as the encryption key. The verification value is formed by hashing the associated encrypted block using a one-way hash function. The file format supports verification of individual file blocks without knowledge of the randomly generated key or any user keys. To verify a block of the file, the file system traverses the tree to the appropriate leaf node associated with a target block to be verified. The file system hashes the target block and if the hash matches the access value contained in the leaf node, the block is authentic.Other References
| InventorsAssigneeApplicationNo. 09814259 filed on 03/21/2001US Classes:713/171, Having key exchange713/189, DATA PROCESSING PROTECTION USING CRYPTOGRAPHY380/211, Interactive TV709/213, MULTICOMPUTER DATA TRANSFERRING VIA SHARED MEMORY380/277, KEY MANAGEMENT713/170, Authentication of an entity and a message725/142, Having particular storage feature713/190, Computer instruction/address encryption713/152Application layer securityField of Search713/171, Having key exchange713/189, DATA PROCESSING PROTECTION USING CRYPTOGRAPHY380/259, Symmetric key cryptography380/37Block/data stream encipheringExaminersPrimary: Wright, Norman M.Attorney, Agent or FirmUS Patent References5317728, Storage management of a first file system using a second file system containing surrogate files and catalog management informationIssued on: 05/31/1994 Inventor: Tevis, et al.5452447, Method and apparatus for a caching file server Issued on: 09/19/1995 Inventor: Nelson, et al.5588147, Replication facility Issued on: 12/24/1996 Inventor: Neeman, et al.5778395, System for backing up files from disk volumes on multiple nodes of a computer network Issued on: 07/07/1998 Inventor: Whiting, et al.5870474, Method and apparatus for providing conditional access in connection-oriented, interactive networks with a multiplicity of service providers Issued on: 02/09/1999 Inventor: Wasilewski, et al.5873085, Virtual file management system Issued on: 02/16/1999 Inventor: Enoki, et al.5907673, Checkpointing computer system having duplicated files for executing process and method for managing the duplicated files for restoring the process Issued on: 05/25/1999 Inventor: Hirayama, et al.5991771, Transaction synchronization in a disconnectable computer and network Issued on: 11/23/1999 Inventor: Falls, et al.6026474, Shared client-side web caching using globally addressable memory Issued on: 02/15/2000 Inventor: Carter, et al.6067545Resource rebalancing in networked computer systems Issued on: 05/23/2000 Inventor: Wolff International ClassG06F 11/30 |
