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:
Mar. 05, 1996
Filed:
Jun. 20, 1994
Atsuko Miyaji, Kawachinagano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a method of implementing digital signatures or verification and a privacy communication using the following: (1) choose a positive integer d such that gives an imaginary quadratic field Q{(-d).sup.1/2 } a small class number, and choose a prime number p such that is expressed by 2.sup.t -.alpha. (where .alpha. is a small number), such that either p+1-a or p+1+a is divisible by a prime number, and such that 4p-a.sup.2 =d.multidot.b.sup.2 to construct a finite field GF(p), or a definition filed of an elliptic curve, then construct an elliptic curve over the finite filed GF(p) having a root for a class polynomial H.sub.d (x)=0 modulo GF(p) as j-invariant; (2) construct elliptic curves E.sub.1, E.sub.2, . . . , E.sub.n in such a way that each will be not isomorphic but have a same number of elements to replace an elliptic curve one from the others.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile