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:
Nov. 29, 2016
Filed:
Mar. 07, 2014
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Abstract
According to an authentication device is for authenticating the validity of a subject ciphertext generated by encrypting a plaintext using homomorphic encryption. The authentication device includes a commitment generator and a response generator. The commitment generator is configured to generate a commitment from a randomly selected verification value, and transmit the commitment to a verification device for verifying the validity of the subject ciphertext. The response generator is configured to generate a response value generated by computing from an acquired challenge value, the plaintext, and the verification value, and transmit the response value to the verification device. The response generator is configured to generate the response value by a third operation where a result of a first operation using the response value is equal to a result of processing the challenge value, the subject ciphertext, and the commitment by a second operation.