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IEICE Trans

Ryuya HAYASHI


On the Implications from Updatable Encryption to Public-Key Cryptographic Primitives
Yuichi TANISHITA Ryuya HAYASHI Ryu ISHII Takahiro MATSUDA Kanta MATSUURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2026/03/01
Vol. E109-A  No. 3  pp. 216-231
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
updatable encryptionpublic-key encryptionoblivious samplabilitylossy encryption
 Summary | Full Text:PDF

Updatable Encryption Secure against Randomness Compromise
Yuichi TANISHITA Ryuya HAYASHI Ryu ISHII Takahiro MATSUDA Kanta MATSUURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2026/03/01
Vol. E109-A  No. 3  pp. 232-245
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
updatable encryptionpublic-key encryptionElGamal encryptionDDH assumptionrandomness compromise
 Summary | Full Text:PDF

Multi-Query Verifiable PIR and Its Application
Ryuya HAYASHI Junichiro HAYATA Keisuke HARA Kenta NOMURA Masaki KAMIZONO Goichiro HANAOKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2025/09/01
Vol. E108-A  No. 9  pp. 1114-1127
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
PIRselective failuresverifiable PIRSNARK
 Summary | Full Text:PDF