Ryo NISHIMAKI


How to Watermark Cryptographic Functions by Bilinear Maps
Ryo NISHIMAKI 
Publication:   
Publication Date: 2019/01/01
Vol. E102-A  No. 1  pp. 99-113
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
program watermarkinglossy trapdoor functionsdual pairing vector space
 Summary | Full Text:PDF(708KB)

Post-Challenge Leakage Resilient Public-Key Cryptosystem in Split State Model
Eiichiro FUJISAKI Akinori KAWACHI Ryo NISHIMAKI Keisuke TANAKA Kenji YASUNAGA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/03/01
Vol. E98-A  No. 3  pp. 853-862
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
post-challenge (bounded) leakagesimultaneous secret-key and sender-randomness leakageCCA2 security for multiple messages
 Summary | Full Text:PDF(864.8KB)

Key-Private Proxy Re-Encryption from Lattices, Revisited
Ryo NISHIMAKI Keita XAGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/01/01
Vol. E98-A  No. 1  pp. 100-116
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Public Key Based Cryptography
Keyword: 
proxy re-encryptionkey privacyanonymitylattices
 Summary | Full Text:PDF(616.6KB)

An Efficient Non-interactive Universally Composable String-Commitment Scheme
Ryo NISHIMAKI Eiichiro FUJISAKI Keisuke TANAKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/01/01
Vol. E95-A  No. 1  pp. 167-175
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Secure Protocol
Keyword: 
universal composabilitycommitmentall-but-one trapdoor functionhomomorphic encryption
 Summary | Full Text:PDF(347.8KB)

A Multi-Trapdoor Commitment Scheme from the RSA Assumption
Ryo NISHIMAKI Eiichiro FUJISAKI Keisuke TANAKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/01/01
Vol. E95-A  No. 1  pp. 176-184
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Secure Protocol
Keyword: 
non-interactive commitmentmulti-trapdoor commitmentnon-malleabilityRSA assumptionweak signature
 Summary | Full Text:PDF(333.1KB)

Universally Composable Identity-Based Encryption
Ryo NISHIMAKI Yoshifumi MANABE Tatsuaki OKAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/01/01
Vol. E91-A  No. 1  pp. 262-271
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Security Notions
Keyword: 
identity-based encryptionIND-ID-CCA2universal composition
 Summary | Full Text:PDF(240.5KB)