File encryption method and file cryptographic system
March 12, 2011. Estimated 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.Patent ReferencesBlock-cipher cryptographic system with chaining Cryptographic file security for multiple domain networks Cryptographic communication security for single domain networks Security system for data processing Data security module Digital audio scrambling system with error conditioning System for protection of software in memory against unauthorized use Patent #: 5081675 Inventors
AssigneeApplicationNo. 668098 filed on 03/12/1991US Classes:713/193, By stored data protection380/22, Having magnetic record carrier (e.g., tape, drum)380/269, Having compression380/281, Using master key (e.g., key-encrypting-key)713/164Security kernel or utilityExaminersPrimary: Swann, Tod R.Attorney, Agent or FirmInternational ClassH04L 009/02Foreign Application Priority Data1990-03-13 JPAbstractIn an information processing system having an upper rank apparatus and an external storage device which performs transmission and reception of data between the storage device and the upper rank apparatus, at least one of encryption and decryption of the data by use of an algorithm controlled by a desired data key is performed in the external storage device, while generation, encryption and decryption of the data key are performed on the upper rank apparatus side. By this configuration, the burden of the upper rank apparatus is largely reduced and the secrecy of data stored in the external storage device can be surely kept without spoiling the throughput of the whole system. | |
