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:
May. 20, 2014
Filed:
Sep. 01, 2011
Mikio Hashimoto, Tokyo, JP;
Hiroyoshi Haruki, Kanagawa, JP;
Takeshi Kawabata, Kanagawa, JP;
Tomohide Jokan, Kanagawa, JP;
Yurie Fujimatsu, Kanagawa, JP;
Ryotaro Hayashi, Kanagawa, JP;
Fukutomo Nakanishi, Tokyo, JP;
Mikio Hashimoto, Tokyo, JP;
Hiroyoshi Haruki, Kanagawa, JP;
Takeshi Kawabata, Kanagawa, JP;
Tomohide Jokan, Kanagawa, JP;
Yurie Fujimatsu, Kanagawa, JP;
Ryotaro Hayashi, Kanagawa, JP;
Fukutomo Nakanishi, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to an embodiment, a memory management device increments a lower value of a first counter, updates the counter by incrementing an upper value and resetting the lower value when the lower value overflows, increments to update the lower counter value when the upper value is incremented as a result of writing a second data piece having the upper value in common to a memory, recalculates a first secret value calculated using the first counter values and a root secret value in response to the first counter update, writes a first data piece and the first secret value to the memory, and at reading of the first data piece and the first secret value, calculates a second secret value using the updated first counter values and the root secret value, and compares the first secret value with the second secret value to verify the first data piece.