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:
Aug. 10, 1993
Filed:
Mar. 12, 1991
Masafumi Nozawa, Odawara, JP;
Akinobu Shimada, Hiratsuka, JP;
Toshifumi Nishimura, Minamiashigara, JP;
Katsuharu Kakuse, Hadano, JP;
Tokuhiro Tsukiyama, Kanagawa, JP;
Kiyoshi Yata, Hadano, JP;
Yasuhiro Ishii, Hadano, JP;
Kazuo Takaragi, Ebina, JP;
Yasushi Kuba, Yokohama, JP;
Fujio Fujita, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In 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.