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:
Oct. 25, 2005
Filed:
Mar. 17, 2000
Masahiko Yamaguchi, Yokohama, JP;
Masahiko Yamaguchi, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In order to shorten the time required for encryption and decryption of communication data, the contents of input data are analyzed by a discrimination method such as pattern matching, and in accordance with this analysis result, it is checked whether the received data is particular data. A portion of data judged as the particular data is encrypted and sent to an output buffer, whereas a portion other than the particular portion is not encrypted but is directly sent to the output buffer. Thereafter, the contents in the output buffer are transmitted. The particular data includes a control code of print data, upper bits of image data, predetermined discrete bits of voice data, a conversion tale for compression data, and the like.