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. 11, 2005
Filed:
Jan. 30, 1998
Junichi Hikita, Kyoto, JP;
Yoshihiro Ikefuji, Kyoto, JP;
Shigemi Chimura, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
Upon receiving an encipherment command, an enciphered authentication data generation circuit generates an enciphered authentication data based on a basic authentication data including a random number portion using an encipherment rule. The encipherment rule changes according to the number of supplied encipherment commands. A transmission circuittransmits the enciphered authentication data. A reception circuitreceives the enciphered authentication data transmitted from a second deviceA prohibition command output circuitdetermines whether the enciphered authentication data transmitted from the second devicematches with an enciphered authentication data that would be generated if the same number of encipherment commands were supplied to an enciphered authentication data generation circuit of a first deviceand outputs a prohibition command to prohibit a transmission of the data to be transmitted when the determination result is negative.