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IEICE Trans

Ryo WATANABE

Improved Differential-Linear Cryptanalysis of Reduced Rounds of ChaCha Permutation
Yurie OKADA Ryo WATANABE Nasratullah GHAFOORI Atsuko MIYAJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2025/09/01
Vol. E108-A  No. 9  pp. 1175-1195
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
symmetric-key cryptography, stream ciphers, ChaCha, Differential-Linear analysis, 
 Summary | Full Text:PDF
UCB-SC: A Fast Variant of KL-UCB-SC for Budgeted Multi-Armed Bandit Problem
Ryo WATANABE Junpei KOMIYAMA Atsuyoshi NAKAMURA Mineichi KUDO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2018/03/01
Vol. E101-A  No. 3  pp. 662-667
Type of Manuscript:  LETTER
Category: Mathematical Systems Science
Keyword: 
budgeted multi-armed bandits, regret analysis, upper confidence bound, 
 Summary | Full Text:PDF
KL-UCB-Based Policy for Budgeted Multi-Armed Bandits with Stochastic Action Costs
Ryo WATANABE Junpei KOMIYAMA Atsuyoshi NAKAMURA Mineichi KUDO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2017/11/01
Vol. E100-A  No. 11  pp. 2470-2486
Type of Manuscript:  PAPER
Category: Mathematical Systems Science
Keyword: 
budgeted multi-armed bandits, asymptotically optimal policy, regret analysis, 
 Summary | Full Text:PDF