| 2017 | ASIACRYPT | New Key Recovery Attacks on Minimal Two-Round Even-Mansour Ciphers. | Takanori Isobe, Kyoji Shibutani |
| 2015 | ASIACRYPT | Midori: A Block Cipher for Low Energy. | Subhadeep Banik, Andrey Bogdanov, Takanori Isobe, Kyoji Shibutani, Harunaga Hiwatari, Toru Akishita, Francesco Regazzoni |
| 2014 | FSE | Improved All-Subkeys Recovery Attacks on FOX, KATAN and SHACAL-2 Block Ciphers. | Takanori Isobe, Kyoji Shibutani |
| 2013 | ASIACRYPT | Generic Key Recovery Attack on Feistel Scheme. | Takanori Isobe, Kyoji Shibutani |
| 2012 | ACISP | Security Analysis of the Lightweight Block Ciphers XTEA, LED and Piccolo. | Takanori Isobe, Kyoji Shibutani |
| 2012 | FSE | Converting Meet-In-The-Middle Preimage Attack into Pseudo Collision Attack: Application to SHA-2. | Ji Li, Takanori Isobe, Kyoji Shibutani |
| 2011 | ACISP | Double SP-Functions: Enhanced Generalized Feistel Networks - Extended Abstract. | Andrey Bogdanov, Kyoji Shibutani |
| 2011 | CHES | Piccolo: An Ultra-Lightweight Blockcipher. | Kyoji Shibutani, Takanori Isobe, Harunaga Hiwatari, Atsushi Mitsuda, Toru Akishita, Taizo Shirai |
| 2009 | FSE | Preimage Attacks on Reduced Tiger and SHA-2. | Takanori Isobe, Kyoji Shibutani |
| 2008 | CARDIS | A Practical DPA Countermeasure with BDD Architecture. | Toru Akishita, Masanobu Katagi, Yoshikazu Miyato, Asami Mizuno, Kyoji Shibutani |
| 2007 | FSE | The 128-Bit Blockcipher CLEFIA (Extended Abstract). | Taizo Shirai, Kyoji Shibutani, Toru Akishita, Shiho Moriai, Tetsu Iwata |
| 2006 | FSE | On Feistel Structures Using a Diffusion Switching Mechanism. | Taizo Shirai, Kyoji Shibutani |
| 2004 | FSE | Improving Immunity of Feistel Ciphers against Differential Cryptanalysis by Using Multiple MDS Matrices. | Taizo Shirai, Kyoji Shibutani |