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:
Aug. 02, 2022
Filed:
Jul. 26, 2019
Canon Kabushiki Kaisha, Tokyo, JP;
Eiji Kadota, Kawasaki, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A communication apparatus includes a communication unit having a first storage area of a predetermined size in which access from another apparatus is permitted and a second storage area of the predetermined size in which access from the other apparatus is permitted, and an encryption unit to generate concatenated encrypted data by using a block encryption method to encrypt a plurality of pieces of data which are to be read out by the other apparatus and encrypted. Data different from the concatenated encrypted data is held in the second storage area, and the concatenated encrypted data generated by the encryption unit is of a size not exceeding the predetermined size and is held in the first storage area. In addition, the size of padding data included in the concatenated encrypted data is smaller than a total size of padding data generated by individually encrypting the plurality of pieces of data.