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:
Apr. 28, 2009
Filed:
Aug. 29, 2002
Kohshiro Inomata, Ashigarakami-gun, JP;
Yasutoshi Maeda, Ashigarakami-gun, JP;
Kohshiro Inomata, Ashigarakami-gun, JP;
Yasutoshi Maeda, Ashigarakami-gun, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
An encryption/decryption system capable of supplying data only to a user making a request. A computer encrypts data with a common key, encrypts the common key with a public key, and transmits the encrypted data and the encrypted common key. A copy machine receives these data, encrypts challenge data with the public key, and transmits the encrypted challenge data to an IC card. The IC card decrypts the encrypted challenge data with a private key, and feeds the decrypted challenge data back to the copy machine. The copy machine transmits the IC card an encrypted common key of reception data offering decrypted challenge data identical to the original challenge data. The IC card decrypts the encrypted common key and feeds the decrypted common key back to the complex copy machine. The complex copy machine decrypts the encrypted data with the common key.