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. 03, 2012
Filed:
Jul. 24, 2007
Yasuyuki Nogami, Okayama, JP;
Yoshitaka Morikawa, Okayama, JP;
Yasuyuki Nogami, Okayama, JP;
Yoshitaka Morikawa, Okayama, JP;
National University Corporation Okayama University, Okayama, JP;
Abstract
There is provided a computer-readable recording medium recording a program for encryption/decryption, an apparatus for encryption/decryption, an apparatus for multiplication in an extension field, that enable to perform high speed multiplication processing, while allowing the selection of arbitrary key lengths. In multiplying two elements A={a, a, a, . . . , a} and B={b, b, b, . . . , b} in an extension field Fof extension degree m with a prime number p as characteristic, firstly, a positive integer k is determined such that km+1 is a prime number and p is a primitive element in F. Next, two elements A and B are multiplied as two elements in extension field Fof extension degree km with a prime number p as characteristic using the positive integer k. Lastly, using the result of such multiplication, a result of multiplication in an element in the extension field Fof extension degree m which is a subfield of Fis obtained.