| 2020 | ISITA | Fourier-based Verifiable Function Secret Sharing. | Takeshi Koshiba |
| 2018 | ICICS | Achieving Full Security for Lattice-Based Group Signatures with Verifier-Local Revocation. | Maharage Nisansala Sevwandi Perera, Takeshi Koshiba |
| 2018 | ICISC | New Assumptions on Isogenous Pairing Groups with Applications to Attribute-Based Encryption. | Takeshi Koshiba, Katsuyuki Takashima |
| 2018 | ISIT | Universal Construction of Cheater-Identifiable Secret Sharing Against Rushing Cheaters Based on Message Authentication. | Masahito Hayashi, Takeshi Koshiba |
| 2018 | ISPEC | Achieving Almost-Full Security for Lattice-Based Fully Dynamic Group Signatures with Verifier-Local Revocation. | Maharage Nisansala Sevwandi Perera, Takeshi Koshiba |
| 2017 | AINA | Secure Deduplication in a Multiple Group Signature Setting. | Ei Mon Cho, Takeshi Koshiba |
| 2017 | AINA | Fully Secure Lattice-Based Group Signatures with Verifier-Local Revocation. | Maharage Nisansala Sevwandi Perera, Takeshi Koshiba |
| 2017 | DBSEC | Efficient Protocols for Private Database Queries. | Tushar Kanti Saha, Mayank, Takeshi Koshiba |
| 2017 | MDM | Secure SMS Transmission Based on Verifiable Hash Convergent Group Signcryption. | Ei Mon Cho, Takeshi Koshiba |
| 2015 | ACISP | Secure Statistical Analysis Using RLWE-Based Homomorphic Encryption. | Masaya Yasuda, Takeshi Shimoyama, Jun Kogure, Kazuhiro Yokoyama, Takeshi Koshiba |
| 2015 | CCS | Secure Data Devolution: Practical Re-encryption with Auxiliary Data in LWE-based Somewhat Homomorphic Encryption. | Masaya Yasuda, Takeshi Koshiba, Takeshi Shimoyama, Jun Kogure, Kazuhiro Yokoyama |
| 2014 | ACISP | Privacy-Preserving Wildcards Pattern Matching Using Symmetric Somewhat Homomorphic Encryption. | Masaya Yasuda, Takeshi Shimoyama, Jun Kogure, Kazuhiro Yokoyama, Takeshi Koshiba |
| 2013 | CCS | Secure pattern matching using somewhat homomorphic encryption. | Masaya Yasuda, Takeshi Shimoyama, Jun Kogure, Kazuhiro Yokoyama, Takeshi Koshiba |
| 2013 | ESORICS | Practical Packing Method in Somewhat Homomorphic Encryption. | Masaya Yasuda, Takeshi Shimoyama, Jun Kogure, Kazuhiro Yokoyama, Takeshi Koshiba |
| 2010 | ICISC | Public Discussion Must Be Back and Forth in Secure Message Transmission. | Takeshi Koshiba, Shinya Sawada |
| 2009 | ACISP | Strengthening the Security of Distributed Oblivious Transfer. | Kai-Yuen Cheong, Takeshi Koshiba, Shohei Nishiyama |
| 2009 | IWSEC | Reducing Complexity Assumptions for Oblivious Transfer. | Kai-Yuen Cheong, Takeshi Koshiba |
| 2005 | EuroCrypt | Computational Indistinguishability Between Quantum States and Its Cryptographic Application. | Akinori Kawachi, Takeshi Koshiba, Harumichi Nishimura, Tomoyuki Yamakami |
| 2004 | MFCS | Universal Test for Quantum One-Way Permutations. | Akinori Kawachi, Hirotada Kobayashi, Takeshi Koshiba, Raymond H. Putra |
| 2004 | PKC | Short Exponent Diffie-Hellman Problems. | Takeshi Koshiba, Kaoru Kurosawa |
| 2003 | ACISP | Theoretical Analysis of chi | Masahiko Takenaka, Takeshi Shimoyama, Takeshi Koshiba |
| 2002 | FSE | Multiple Linear Cryptanalysis of a Reduced Round RC6. | Takeshi Shimoyama, Masahiko Takenaka, Takeshi Koshiba |
| 2002 | PKC | On Sufficient Randomness for Secure Public-Key Cryptosystems. | Takeshi Koshiba |
| 2001 | ISAAC | Polynomial-Time Algorithms for the Equivalence for One-Way Quantum Finite Automata. | Takeshi Koshiba |
| 2001 | PKC | A New Aspect for Security Notions: Secure Randomness in Public-Key Encryption Schemes. | Takeshi Koshiba |
| 2000 | DLT | A Note on Finding One-Variable Patterns Consistent with Examples and Counterexamples. | Takeshi Koshiba, Kunihiko Hiraishi |
| 1999 | ICISC | A Technique for Boosting the Security of Cryptographic Systems with One-Way Hash Functions. | Takeshi Koshiba |
| 1998 | KES | Enhancing D-ABDUCTOR towards a diagrammatic user interface platform. | Kazuo Misue, Kiyoshi Nitta, Kozo Sugiyama, Takeshi Koshiba, R. Inder |
| 1997 | ICICS | Computational learning theoretic cryptanalysis of language theoretic cryptosystems. | Takeshi Koshiba |
| 1996 | AI | Decision Tree Learning Systems with Switching Evaluators. | Takeshi Koshiba |
| 1995 | ALT | Learning Strongly Deterministic Even Linear Languages from Positive Examples. | Takeshi Koshiba, Erkki Mkinen, Yuji Takada |