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. 20, 2022
Filed:
Apr. 25, 2019
Applicant:
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Inventor:
Ryo Nishimaki, Musashino, JP;
Assignee:
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09C 1/00 (2006.01); H04L 9/06 (2006.01); H04L 9/08 (2006.01); H04L 9/30 (2006.01);
U.S. Cl.
CPC ...
G09C 1/00 (2013.01); H04L 9/0618 (2013.01); H04L 9/085 (2013.01); H04L 9/0861 (2013.01); H04L 9/30 (2013.01);
Abstract
A transformation key generation apparatus has key generation means for receiving a decryption key sks of a first public key encryption scheme Σs and a public key pkd of a second public key encryption scheme Σd, and generating a transformation key utks→d for transforming first ciphertext cts of the first public key encryption scheme Σs into second ciphertext tct of the second public key encryption scheme Σd by using a probabilistic circuit or function secret sharing.