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Distinguished Researcher Fuyuki Kitagawa
  • Distinguished Researcher

    Fuyuki Kitagawa

  • NTT Social Informatics Laboratories

Research on public key cryptography and design of quantum cryptographic primitives

We study the theory of public key encryption schemes and more advanced ones. We are also interested in the intersection between cryptography and quantum information such as design of new cryptographic primitives utilizing the power of quantum information. Especially, we study cryptographic primitives based on the quantum no-cloning theorem such as quantum money and quantum copy protection.

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Academic Activities

  • PKC 2022, 2024 program committee member
  • ASIACRYPT 2024 program committee member
  • CT-RSA 2025 program committee member

Publications

Selected Papers

  • Fuyuki Kitagawa, Ryo Nishimaki, and Keisuke Tanaka, Obfustopia Built on Secret-Key Functional Encryption, EUROCRYPT 2018.
  • Fuyuki Kitagawa, Takahiro Matsuda, and Keisuke Tanaka, CCA Security and Trapdoor Functions via Key-Dependent-Message Security, CRYPTO 2019.
  • Fuyuki Kitagawa and Takahiro Matsuda, CPA-to-CCA Transformation for KDM Security, TCC 2019.
  • Fuyuki Kitagawa, Ryo Nishimaki, and Takashi Yamakawa, Secure Software Leasing from Standard Assumptions, TCC 2021.
  • Fuyuki Kitagawa and Ryo Nishimaki, Watermarking PRFs Against Quantum Adversaries, EUROCRYPT 2022.
  • Fuyuki Kitagawa and Ryo Nishimaki, Functional Encryption with Secure Key Leasing, ASIACRYPT 2022.
  • Fuyuki Kitagawa, Tomoyuki Morimae, and Takashi Yamakawa, A Simple Framework for Secure Key Leasing, EUROCRYPT 2025.
  • Fuyuki Kitagawa, Ryo Nishimaki, and Nikhil Pappu, PKE and ABE with Collusion-Resistant Secure Key Leasing, CRYPTO 2025.

Keywords

Public key encryption, Chosen ciphertext security, functional encryption, quantum information, quantum money, quanum copy protection

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