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:
May. 12, 1998
Filed:
Aug. 07, 1995
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A 6-digit decimal input value A and a previously prepared 6-digit decimal extension fixed value L are substituted in an extension function f, thereby extending the input value A to a 12-digit decimal value f(A,L). This extended value f(A,L) is bit-agitated with a bit agitation key R. Further, a value C obtained by the bit agitation processing is substituted in a reduction function g, thereby obtaining a 6-digit decimal output value B. Thus, the input value A is extended by the extension processing to be thereafter subjected to the bit agitation processing, whereby safety of secret information can be improved without increasing the number of digits of the input value A. Further, the value obtained by the bit agitation is thereafter reduced, whereby the output value B can be reduced to a number of digits which is applicable to the human memory. Thus, a bit agitator is obtained which is safer than at conventional one and has an excellent user interface.