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:
Feb. 14, 2012
Filed:
Oct. 22, 2008
Flash memory device having secure file deletion function and method for securely deleting flash file
Seungmin Park, Daejeon, KR;
Jaemyoung Kim, Daejeon, KR;
Yungjoon Jung, Daejeon, KR;
Donghyouk Lim, Daejeon, KP;
Youngbin Seo, Daejeon, KR;
Yookun Cho, Seoul, KR;
Sangho Yi, Seoul, KR;
Jaeheung Lee, Seoul, KR;
Seokhyun Kim, Seoul, KR;
Jinha OH, Daegu, KR;
Seungmin Park, Daejeon, KR;
Jaemyoung Kim, Daejeon, KR;
Yungjoon Jung, Daejeon, KR;
Donghyouk Lim, Daejeon, KP;
Youngbin Seo, Daejeon, KR;
Yookun Cho, Seoul, KR;
Sangho Yi, Seoul, KR;
Jaeheung Lee, Seoul, KR;
Seokhyun Kim, Seoul, KR;
Jinha Oh, Daegu, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
Disclosed is a flash memory device having a secure flash file deletion function and a method for securely deleting a flash file. Data and object headers as actual contents of the flash file are separately stored in data blocks and header blocks. At this time, the data is encrypted and stored, and a decryption key is included in an object header and stored in a header block. When the flash file is deleted, the object header is deleted by searching the header block where the object header including the decryption key is stored. In order to search the header block, a binary tree structure is used in which a terminal node indicates an LSB of a file ID. Disclosed may be applied to an embedded system where a flash memory is used as a storage medium. In particular, disclosed is suitable for a NAND flash memory device.