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:
Jan. 11, 2000
Filed:
May. 20, 1997
Applicant:
Inventors:
Yoshio Mochizuki, Kawasaki, JP;
Yuuichi Tatsumi, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380-4 ;
Abstract
Cryptographic key data and data subjected to an operation by use of the cryptographic key data are previously stored in a memory cell array. A memory cell in which the cryptographic key data is stored is accessed and latched and the cryptographic key data is latched in a latch circuit before read out data from the memory cell array. After this, the latched data and data output from a sense amplifier are subjected to an operation by an arithmetical circuit to decode the data and the result of the operation is output as readout data.