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:
Oct. 20, 2009
Filed:
Apr. 23, 2002
Yin Shih, Saratoga, CA (US);
Yin Shih, Saratoga, CA (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
A cipher engine performs cipher processing (encrypting/decrypting) on logical data streams in a physical data stream in a storage device. As the physical data stream changes from a first logical data stream to a second logical data stream, and the cipher engine switches from cipher processing the first logical data stream to the second logical data stream, cipher information of the first logical data stream is stored in a cipher state memory, cipher information of the second logical data stream is retrieved from the cipher state memory, and the cipher engine resumes cipher processing the second logical data stream using the cipher information of the second logical data stream. Advantageously, a virtually unlimited number of logical data streams is supported and duplicate cipher hardware is avoided.