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. 10, 1989
Filed:
Nov. 12, 1985
Takayoshi Shiraishi, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A system for enciphering or deciphering wherein bit patterns in a binary number notation of a plurality of elements, which an irreducible polynomial in the Galois field GF (2.sup.i) has, are stored in registers arranged in a certain correspondence with the bit positions of input data or messages, as random numbers for an encryption key or decryption key. The bit patterns retained in the registers corresponding to the digit of bit '1' in the input data are subjected to a mod 2 addition operation independently for each digit of the random numbers, to thereby obtain encipher or decipher data corresponding to the input data. The elements to be used for the encipher and decipher keys have a specific relationship therebetween in conformity with the periodical characteristic of the elements the irreducible polynomial has.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile