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, 2017
Filed:
Jun. 27, 2013
Nec Corporation, Minato-ku, Tokyo, JP;
Tomoyasu Suzuki, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A problem to be solved is to reduce processing time when a block cipher which refers to a table is implemented in software. An encryption device includes: a round-key generation module which generates a round key from a secret key; a table-entry generation module which adds a starting address of an n-bit S-box table (n≧2) aligned to a 2m-bit boundary (m≧n) in a memory, and the round key, and holds an obtained value as a table entry; and a data mixing module which mixes data by referring to the S-box stored in the first memory, by using, as a table index, an exclusive OR between the table entry stored in the second memory and the data.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile