Our research group is studying theoretical aspects for cryptography and information security. Recent research topics include:
  • Cryptanalysis of Public Key Cryptosystems
    • Cryptanalysis based on number theory, algorithm and complexity theory
      • Cryptanalysis based on lattice reduction algorithms
      • Cryptanalysis under the secret key leakage
    • Cryptanalysis based on Quantum Computers
  • Proposal of Cryptographic Schemes
    • Proposal of Quantum-Safe Cryptographic Schemes
    • Proposal of High-functional cryptographic schemes and protocols



  • Professor: Noboru Kunihiro [Link]



  • Shunsuke Odani (2020.4-2022.3, Master course)
  • Hyungrok Jo [Link] (2017.4-2021.9, Researcher)

To Foreign Students

  • For general information of our department, visit here.
  • To avoid mismatch of research theme, read our recent research topics and check whether your research interests match to ours.
  • If you contact us, write the research topics you are interested in and the research plan you want to conduct in our laboratory.


  • Address: 1-1-1, Tennodai, Tsukuba, Ibaraki, 305-8573, Japan