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:
Apr. 30, 1985
Filed:
Jul. 14, 1982
Shoji Miyaguchi, Yokohama, JP;
Nippon Telegraph & Telephone Public Corporation, Tokyo, JP;
Abstract
A cryptosystem for the RSA cryptography which calculates C.ident.M.sup.e mod n and, for this calculation, performs an operation C=M.sub.1 .times.M.sub.2 mod n. An operation ##EQU1## is performed in the order j=l, l-1, . . . 1 to obtain last R.sub.1 as the result of the calculation M.sub.1 .times.M.sub.2 mod n. The calculation ##EQU2## is performed in a quotient calculating unit, and the calculation M.sub.1 .times.M.sub.2,j '+2.sup..lambda. R.sub.j+1 -Q.sub.j .multidot.n is performed in a main adding unit. Where, variable R.sub.j may be divided into two parts R.sub.j,0 and R.sub.j,1. In this way, the multiplication and the division are simultaneously conducted, thereby to raise the calculation speed.