The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 1991
Filed:
Dec. 09, 1988
Scott B Hamilton, Kirkland, WA (US);
Michael J Rosenow, Issaquah, WA (US);
The Exchange System Limited Partnership, Bellevue, WA (US);
Abstract
An improved method and system for backing-up secure files in a data encryption unit is described. In accordance with the teachings of this invention, encrypted files are read from the memory of a first encryption device and stored in a temporary location. The encrypted files are then re-encrypted under a predefined encryption key and stored in a removable non-volatile memory device. To restore a file, the re-encrypted files are read from the non-volatile memory device, decrypted under the predefined key and stored in the temporary memory location. The recovered files are then loaded into memory of the first device from the temporary memory location. The present invention further includes means for destroying the contents of the non-volatile storage device upon the detection of tampering therewith.