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:
Mar. 17, 2026
Filed:
Feb. 09, 2024
Mitsubishi Electric Corporation, Tokyo, JP;
Yusuke Naito, Tokyo, JP;
MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;
Abstract
A hash value computation device () computes a hash value H of 2n bits using a block cipher E that takes as input a key K of k bits and a plaintext block P of n bits, which is a smaller number of bits than k bits, and outputs a ciphertext of n bits. A function computation unit () computes a function CF that processes the block cipher E a plurality of times sequentially on an input value M* of k−n bits, an input value S[1] of n bits, and an input value S[2] of n bits so as to compute an output value S'[1] of n bits and an output value S′[2] of n bits. A hash value computation unit () computes the hash value H from the output value S′[1] and the output value S′[2].
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