Takato HIRANO


Proxy Re-Encryption That Supports Homomorphic Operations for Re-Encrypted Ciphertexts
Yutaka KAWAI Takahiro MATSUDA Takato HIRANO Yoshihiro KOSEKI Goichiro HANAOKA 
Publication:   
Publication Date: 2019/01/01
Vol. E102-A  No. 1  pp. 81-98
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
Proxy Re-encryptionhomomorphic encryption
 Summary | Full Text:PDF

Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application
Mitsuhiro HATTORI Takato HIRANO Takashi ITO Nori MATSUDA Takumi MORI Yusuke SAKAI Kazuo OHTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/01/01
Vol. E96-A  No. 1  pp. 53-67
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Based Protocols
Keyword: 
hidden vector encryptionsearchable encryptionpairing-based cryptography
 Summary | Full Text:PDF

Key Generation for Fast Inversion of the Paillier Encryption Function
Takato HIRANO Keisuke TANAKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/06/01
Vol. E93-A  No. 6  pp. 1111-1121
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Cryptography and Information Security
Keyword: 
Paillier's encryption functionkey generationinversionRSAChinese remainder theorem
 Summary | Full Text:PDF

Primitive Power Roots of Unity and Its Application to Encryption
Takato HIRANO Koichiro WADA Keisuke TANAKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/08/01
Vol. E92-A  No. 8  pp. 1836-1844
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Theory
Keyword: 
Paillier's encryption schemefactoringhomomorphismpower roots of unity
 Summary | Full Text:PDF