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:
May. 05, 2026
Filed:
May. 08, 2024
Axell Corporation, Tokyo, JP;
Yusuke Hoshizuki, Tokyo, JP;
Kotaro Matsuoka, Tokyo, JP;
AXELL CORPORATION, Tokyo, JP;
Abstract
In order to realize four arithmetic operations in Integer-wise type TFHE, an encryption processing apparatus that processes a ciphertext is provided, the ciphertext being a fully homomorphic ciphertext that has, as a plaintext associated with an integer, a value with an error having a predetermined variance added thereto within a predetermined value range and that is able to be subjected to a predetermined operation between integers without being decrypted. The apparatus includes applying a first polynomial in which all coefficients are the same to an operation result of a homomorphic operation between a ciphertext based on a first ciphertext (ca) and a ciphertext based on a second ciphertext (cb), to obtain a third ciphertext (cd) indicating a position of a plaintext in the operation result, and applying a predetermined polynomial to a ciphertext obtained by reducing a range of plaintext to a predetermined range in the value range by homomorphic addition of the third ciphertext to the operation result, to perform an operation between the first ciphertext and the second ciphertext.