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:
Jul. 21, 2009
Filed:
Apr. 18, 2003
Hiromi Matsuda, Kanagawa, JP;
Takafumi Hosoi, Tokyo, JP;
Masao Tanaka, Kanagawa, JP;
Takayasu Kon, Tokyo, JP;
Hiromi Matsuda, Kanagawa, JP;
Takafumi Hosoi, Tokyo, JP;
Masao Tanaka, Kanagawa, JP;
Takayasu Kon, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
Input data (plain text data or encrypted text data) are latched according to a clock CLKand, after initial transposition thereof, the data are outputted from a selector. The lower-order bits of the output data from the selector are processed through expanded transposition and then are calculated together with key data Kin an XOR circuit, and the result data are latched according to a clock CLKThe latched 48-bit data are divided into eight 6-bits data, each of which is then replaced with 4-bit data, and after combination thereof, the data are transposed. In the calculations of second and subsequent stages, the data obtained through replacement and combination in a replacement/combination circuit are latched according to the clock CLKand then are outputted from the selector. And after completion of the 16th-stage calculation, the data replaced in a replacement circuit are inversely transposed.