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. 14, 2020
Filed:
Aug. 18, 2015
Nec Corporation, Tokyo, JP;
Kazuhiko Minematsu, Tokyo, JP;
NEC CORPORATION, Minato-ku, Tokyo, JP;
Abstract
An information-processing device is provided with: a plaintext input unit for inputting plaintext; an initial vector generation unit for generating an initial vector; a common key block encryption unit for performing common key block encryption on the initial vector and generating an encrypted initial vector; a pseudorandom number generation unit which, accepting the encrypted initial vector as input, generates a pseudorandom number series in the same length as the plaintext; a keyed hash unit which, accepting the first portion of a ciphertext in which the pseudorandom number series and the plaintext are exclusive-OR'ed as input, generates a hash value; and a ciphertext output unit for concatenating the second and first portions of a ciphertext in which the hash value and the encrypted initial vector are exclusive-OR'ed and outputting the concatenated portions as a ciphertext.