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:
Sep. 15, 2026
Filed:
Aug. 31, 2023
Kabushiki Kaisha Toshiba, Tokyo, JP;
Koichiro Akiyama, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
According to one embodiment, an encryption device includes a memory and one or more processors. The one or more processors are configured to: acquire, as a public key, an n-variable symmetric indeterminate equation having an element not more than a constant degree of F[t] and determined depending on a total degree of each term, and being symmetric for at least two variables; randomly generate an n-variable polynomial having an element not more than a constant degree of F[t], randomly generate an n-variable symmetric polynomial having an element not more than a constant degree of F[t] and determined depending on a total degree of each term, and being symmetric for at least two variables, and randomly generate a noise polynomial having an element not more than a constant degree of F[t]; and generate a ciphertext from the three polynomials and the n-variable symmetric indeterminate equation for the n-variable plaintext polynomial.