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IEICE Trans

Kosei SAKAMOTO

SAT-Based Differential Analysis of Initialization Phase of AEGIS/Tiaoxin-346/Rocca/Rocca-S
Takuro SHIRAYA Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2025/12/01
Vol. E108-D  No. 12  pp. 1507-1525
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication System Security)
Category: 
Keyword: 
AEAD, differential analysis, SAT solver, 
 Summary | Full Text:PDF
Towards Finding Better Differentials on Multiple-Branch-Based Structures with the SAT Method
Kazuma TAKA Tatsuya ISHIKAWA Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2025/06/01
Vol. E108-A  No. 6  pp. 816-833
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
differential cryptanalysis, clustering effect, multiple-branch-based designs, Orthros, SAT-based automatic search method, 
 Summary | Full Text:PDF
Finding New Differential Characteristics on SPECK Family
Rikuto KURAHARA Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2025/05/01
Vol. E108-A  No. 5  pp. 760-763
Type of Manuscript:  LETTER
Category: Cryptography and Information Security
Keyword: 
symmetric-key cipher, SPECK, differential characteristics, SAT solver, 
 Summary | Full Text:PDF
SAT-Based Analysis of Related-Key Impossible Distinguishers on Piccolo and (Tweakable) TWINE
Shion UTSUMI Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2024/08/01
Vol. E107-A  No. 8  pp. 1186-1195
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
Piccolo, TWINE, related-key impossible differential attack, SAT, 
 Summary | Full Text:PDF
Improving the Security Bounds against Differential Attacks for Pholkos Family
Nobuyuki TAKEUCHI Kosei SAKAMOTO Takuro SHIRAYA Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2024/08/01
Vol. E107-A  No. 8  pp. 1196-1204
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
Pholkos, differential attack, active S-box, MILP, 
 Summary | Full Text:PDF
Security Evaluation of Initialization Phases and Round Functions of Rocca and AEGIS
Nobuyuki TAKEUCHI Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2023/03/01
Vol. E106-A  No. 3  pp. 253-262
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
AEAD, round function, active S-box, impossible differential attack, integral attack, MILP, 
 Summary | Full Text:PDF
On Optimality of the Round Function of Rocca
Nobuyuki TAKEUCHI Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2023/01/01
Vol. E106-A  No. 1  pp. 45-53
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
AES-NI, fast software implementation, AEAD, round function, 
 Summary | Full Text:PDF
Applying Byte-Shuffling to CLEFIA-Type Structure
Kazuto SHIMIZU Kosei SAKAMOTO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2022/03/01
Vol. E105-A  No. 3  pp. 268-277
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
block cipher, GFN, CLEFIA, byte-shuffling, active S-box, 
 Summary | Full Text:PDF
Design of a Linear Layer for a Block Cipher Based on Type-2 Generalized Feistel Network with 32 Branches
Kosei SAKAMOTO Kazuhiko MINEMATSU Nao SHIBATA Maki SHIGERI Hiroyasu KUBO Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2022/03/01
Vol. E105-A  No. 3  pp. 278-288
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
Type-2 Generalized Feistel Network, permutation, MILP, 
 Summary | Full Text:PDF
Practical Integral Distinguishers on SNOW 3G and KCipher-2
Jin HOKI Kosei SAKAMOTO Kazuhiko MINEMATSU Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2021/11/01
Vol. E104-A  No. 11  pp. 1603-1611
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
stream cipher, SNOW 3G, KCipher-2, integral attack, division property, MILP, 
 Summary | Full Text:PDF
MILP-Aided Security Evaluation of Differential Attacks on KCipher-2
Jin HOKI Kosei SAKAMOTO Fukang LIU Kazuhiko MINEMATSU Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2021/01/01
Vol. E104-A  No. 1  pp. 203-212
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
stream cipher, KCipher-2, differential attack, active S-box, MILP, 
 Summary | Full Text:PDF
Tweakable TWINE: Building a Tweakable Block Cipher on Generalized Feistel Structure
Kosei SAKAMOTO Kazuhiko MINEMATSU Nao SHIBATA Maki SHIGERI Hiroyasu KUBO Yuki FUNABIKI Andrey BOGDANOV Sumio MORIOKA Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2020/12/01
Vol. E103-A  No. 12  pp. 1629-1639
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
twekakble block cipher, generalized feistel structure, TWINE, MILP, 
 Summary | Full Text:PDF
Security of Related-Key Differential Attacks on TWINE, Revisited
Kosei SAKAMOTO Kazuhiko MINEMATSU Nao SHIBATA Maki SHIGERI Hiroyasu KUBO Yuki FUNABIKI Takanori ISOBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2020/01/01
Vol. E103-A  No. 1  pp. 212-214
Type of Manuscript:  Special Section LETTER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
block cipher, related-key security, active sbox, MILP, 
 Summary | Full Text:PDF