File access security method and means
Patent 4588991 Issued on May 13, 1986. Estimated Expiration Date: 
May 13, 2003. 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.
May 13, 2003. 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 ReferencesHigh security system for electronic signature verification End-to-end encryption system and method of operation Patent #: 4423287 InventorAssigneeApplicationNo. 06/472609 filed on 03/07/1983US Classes:713/165, File protection235/382, Permitting access340/5.74, Access to electrical information713/193By stored data protectionExaminersPrimary: Yusko, Donald J.Attorney, Agent or FirmInternational ClassesG06F 1/00 (20060101)G06F 12/14 (20060101) G06F 21/00 (20060101) AbstractAn improved file access security technique and associated apparatus accesses data which is stored in encrypted form under one encryption key and re-stores the data re-encrypted under another encryption key, and produces a record of each access and data re-encryption both as the control source of encryption keys for access and re-entry of encrypted data and as a secured audit record of users that had access to each file. | |
