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:
Aug. 15, 2006
Filed:
Sep. 26, 2000
Makoto Sato, Tachikawa, JP;
Tsuneharu Takeda, Hamura, JP;
Junji Mori, Akishima, JP;
Kazuo Kurosawa, Kawasaki, JP;
Makoto Sato, Tachikawa, JP;
Tsuneharu Takeda, Hamura, JP;
Junji Mori, Akishima, JP;
Kazuo Kurosawa, Kawasaki, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
In a database, a frequently retrieved column is encrypted using a common key, and other columns are encrypted using a specific row key. Thus, a retrieving process can be performed at a high speed, and the security can be improved. Then, the row and column of the database are encrypted by assuming the plaintext to be encrypted as a bit string, and performing a binary operation with a random bit string. A random bit string is obtained by sequentially generating multidimensional vectors using a nonlinear function by defining a predetermined bit length as 1 word and a plurality of words as components of the multidimensional vector.