Multi-bit Cryptosystems Based on Lattice Problems. - Akinori Kawachi; Keisuke Tanaka; Keita Xagawa (Public Key Cryptography, 2007)

Concurrently Secure Identification Schemes Based on the Worst-Case Hardness of Lattice Problems. - Akinori Kawachi; Keisuke Tanaka; Keita Xagawa (ASIACRYPT, 2008)

Zero-Knowledge Protocols for NTRU: Application to Identification and Proof of Plaintext Knowledge. - Keita Xagawa; Keisuke Tanaka (ProvSec, 2009)

Efficient Public Key Encryption Based on Ideal Lattices. - Damien Stehlé; Ron Steinfeld; Keisuke Tanaka; Keita Xagawa (IACR Cryptol. ePrint Arch., 2009)

Security of Encryption Schemes in Weakened Random Oracle Models. - Akinori Kawachi; Akira Numayama; Keisuke Tanaka; Keita Xagawa (IACR Cryptol. ePrint Arch., 2010)

Security Enhancements by OR-Proof in Identity-Based Identification. - Atsushi Fujioka; Taiichi Saito; Keita Xagawa (ACNS, 2012)

Applicability of OR-Proof Techniques to Hierarchical Identity-Based Identification. - Atsushi Fujioka; Taiichi Saito; Keita Xagawa (CANS, 2012)

Security Enhancement of Identity-Based Identification with Reversibility. - Atsushi Fujioka; Taiichi Saito; Keita Xagawa (ICICS, 2012)

Practical and post-quantum authenticated key exchange from one-way secure key encapsulation mechanism. - Atsushi Fujioka; Koutarou Suzuki; Keita Xagawa; Kazuki Yoneyama (AsiaCCS, 2013)

Cryptanalysis of the Huang-Liu-Yang Cryptosystem from PKC 2012. - Yosuke Todo; Keita Xagawa (IACR Cryptol. ePrint Arch., 2013)

Message Authentication Codes Secure against Additively Related-Key Attacks. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2013)

Practical Cryptanalysis of a Public-Key Encryption Scheme Based on New Multivariate Quadratic Assumptions. - Martin R. Albrecht; Jean-Charles Faugère; Robert Fitzpatrick; Ludovic Perret; Yosuke Todo; Keita Xagawa (Public Key Cryptography, 2014)

Non-malleable Multiple Public-Key Encryption. - Atsushi Fujioka; Eiichiro Fujisaki; Keita Xagawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Secure Hierarchical Identity-Based Identification without Random Oracles. - Atsushi Fujioka; Taiichi Saito; Keita Xagawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Efficient RKA-Secure KEM and IBE Schemes Against Invertible Functions. - Eiichiro Fujisaki; Keita Xagawa (LATINCRYPT, 2015)

Strongly secure authenticated key exchange from factoring, codes, and lattices. - Atsushi Fujioka; Koutarou Suzuki; Keita Xagawa; Kazuki Yoneyama (Des. Codes Cryptogr., 2015)

Verifiably encrypted signatures with short keys based on the decisional linear problem and obfuscation for encrypted VES. - Ryo Nishimaki; Keita Xagawa (Des. Codes Cryptogr., 2015)

Re-encryption, functional re-encryption, and multi-hop re-encryption: A framework for achieving obfuscation-based security and instantiations from lattices. - Nishanth Chandran; Melissa Chase; Feng-Hao Liu; Ryo Nishimaki; Keita Xagawa (IACR Cryptol. ePrint Arch., 2015)

Note on the RKA security of Continuously Non-Malleable Key-Derivation Function from PKC 2015. - Eiichiro Fujisaki; Keita Xagawa (IACR Cryptol. ePrint Arch., 2015)

Improved (Hierarchical) Inner-Product Encryption from Lattices. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2015)

Key-Private Proxy Re-Encryption from Lattices, Revisited. - Ryo Nishimaki; Keita Xagawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Public-Key Cryptosystems Resilient to Continuous Tampering and Leakage of Arbitrary Functions. - Eiichiro Fujisaki; Keita Xagawa (ASIACRYPT (1), 2016)

Groth-Sahai Proofs Revisited Again: A Bug in "Optimized" Randomization. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2016)

Cryptanalysis of Comparable Encryption in SIGMOD'16. - Caleb Horst; Ryo Kikuchi; Keita Xagawa (SIGMOD Conference, 2017)

Quantum Multicollision-Finding Algorithm. - Akinori Hosoyamada; Yu Sasaki; Keita Xagawa (IACR Cryptol. ePrint Arch., 2017)

Tightly-Secure Key-Encapsulation Mechanism in the Quantum Random Oracle Model. - Tsunekazu Saito; Keita Xagawa; Takashi Yamakawa (IACR Cryptol. ePrint Arch., 2017)

Practical Cryptanalysis of a Public-key Encryption Scheme Based on Non-linear Indeterminate Equations at SAC 2017. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2017)

Cryptanalysis of Compact-LWE. - Jonathan Bootle; Mehdi Tibouchi; Keita Xagawa (CT-RSA, 2018)

Improved Quantum Multicollision-Finding Algorithm. - Akinori Hosoyamada; Yu Sasaki; Seiichiro Tani; Keita Xagawa (IACR Cryptol. ePrint Arch., 2018)

Practical Attack on RaCoSS-R. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2018)

(Tightly) QCCA-Secure Key-Encapsulation Mechanism in the Quantum Random Oracle Model. - Keita Xagawa; Takashi Yamakawa (IACR Cryptol. ePrint Arch., 2018)

Accumulable optimistic fair exchange from verifiably encrypted homomorphic signatures. - Jae Hong Seo; Keita Emura; Keita Xagawa; Kazuki Yoneyama (Int. J. Inf. Sec., 2018)

ModFalcon: compact signatures based on module NTRU lattices. - Chitchanok Chuengsatiansup; Thomas Prest; Damien Stehlé; Alexandre Wallet; Keita Xagawa (IACR Cryptol. ePrint Arch., 2019)

Post-Quantum Provably-Secure Authentication and MAC from Mersenne Primes. - Houda Ferradi; Keita Xagawa (IACR Cryptol. ePrint Arch., 2019)

Quantum Random Oracle Model with Auxiliary Input. - Minki Hhan; Keita Xagawa; Takashi Yamakawa (IACR Cryptol. ePrint Arch., 2019)

Cryptanalysis of a New Code-based Signature Scheme with Shorter Public Key in PKC 2019. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2019)

Cryptanalysis of a rank-based signature with short public keys. - Nicolas Aragon; Olivier Blazy; Jean-Christophe Deneuville; Philippe Gaborit; Terry Shue Chien Lau; Chik How Tan; Keita Xagawa (Des. Codes Cryptogr., 2020)

Non-Committing Encryption with Constant Ciphertext Expansion from Standard Assumptions. - Yusuke Yoshida; Fuyuki Kitagawa; Keita Xagawa; Keisuke Tanaka (IACR Cryptol. ePrint Arch., 2020)

Quantum algorithm for the multicollision problem. - Akinori Hosoyamada; Yu Sasaki; Seiichiro Tani; Keita Xagawa (Theor. Comput. Sci., 2020)

The Boneh-Katz Transformation, Revisited: Pseudorandom/Obliviously-Samplable PKE from Lattices and Codes and Its Application. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2021)

Anonymity of NIST PQC Round-3 KEMs. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2021)

Fault-Injection Attacks against NIST's Post-Quantum Cryptography Round 3 KEM Candidates. - Keita Xagawa; Akira Ito 002; Rei Ueno; Junko Takahashi; Naofumi Homma (IACR Cryptol. ePrint Arch., 2021)

Cryptanalysis of Boyen's attribute-based encryption scheme in TCC 2013. - Shweta Agrawal 001; Rajarshi Biswas; Ryo Nishimaki; Keita Xagawa; Xiang Xie; Shota Yamada 001 (Des. Codes Cryptogr., 2022)

Probabilistic Hash-and-Sign with Retry in the Quantum Random Oracle Model. - Haruhisa Kosuge; Keita Xagawa (IACR Cryptol. ePrint Arch., 2022)

Post-Quantum Anonymity of Kyber. - Varun Maram; Keita Xagawa (IACR Cryptol. ePrint Arch., 2022)

Curse of Re-encryption: A Generic Power/EM Analysis on Post-Quantum KEMs. - Rei Ueno; Keita Xagawa; Yutaro Tanaka; Akira Ito 002; Junko Takahashi; Naofumi Homma (IACR Trans. Cryptogr. Hardw. Embed. Syst., 2022)

Making the Identity-Based Diffie-Hellman Key Exchange Efficiently Revocable. - Kohei Nakagawa; Atsushi Fujioka; Akira Nagai; Junichi Tomida; Keita Xagawa; Kan Yasuda (LATINCRYPT, 2023)

Signatures with Memory-Tight Security in the Quantum Random Oracle Model. - Keita Xagawa (IACR Cryptol. ePrint Arch., 2023)

Multiple-Valued Plaintext-Checking Side-Channel Attacks on Post-Quantum KEMs. - Yutaro Tanaka; Rei Ueno; Keita Xagawa; Akira Ito 002; Junko Takahashi; Naofumi Homma (IACR Trans. Cryptogr. Hardw. Embed. Syst., 2023)

Chameleon Hashing Security Enhancement to Hierarchical Identity-Based Identification. - Atsushi Fujioka; Keisuke Saito; Taiichi Saito; Keita Xagawa (ISITA, 2024)

On the Efficiency of Generic, Quantum Cryptographic Constructions. - Keita Xagawa (IACR Commun. Cryptol., 2024)

Strong Existential Unforgeability and More of MPC-in-the-Head Signatures. - Mukul Kulkarni; Keita Xagawa (IACR Cryptol. ePrint Arch., 2024)

Quantum Group Actions. - Tomoyuki Morimae; Keita Xagawa (IACR Cryptol. ePrint Arch., 2024)

Post-quantum Cryptographic Analysis of SSH. - Benjamin Bencina; Benjamin Dowling; Varun Maram; Keita Xagawa (IACR Cryptol. ePrint Arch., 2025)

The Security of Hash-and-Sign with Retry against Superposition Attacks. - Haruhisa Kosuge; Keita Xagawa (IACR Cryptol. ePrint Arch., 2025)

The Security of ML-DSA against Fault-Injection Attacks. - Haruhisa Kosuge; Keita Xagawa (IACR Cryptol. ePrint Arch., 2025)