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:
Mar. 17, 2020
Filed:
Sep. 23, 2016
Apple Inc., Cupertino, CA (US);
Eric B. Tamura, Sunnyvale, CA (US);
Kelly B. Yancey, Pleasanton, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Representative embodiments set forth herein disclose techniques for modifying encryption classes of files. According to some embodiments, a technique can include receiving a request to update an encryption configuration of a file from a current encryption class to an updated encryption class. In response, the technique involves obtaining (i) a first class key associated with the current encryption class, and (ii) a second class key associated with the updated encryption class. Next, the technique involves identifying file extents of the file, where each file extent is encrypted by a respective extent key that is encrypted by the first class key. Finally, the technique involves, for each file extent of the file: (i) decrypting the respective extent key using the first class key to produce a decrypted respective extent key, and (ii) encrypting the decrypted respective extent key using the second class key to produce an updated respective extent key.