Graduate School of
Science and Engineering

Our laboratory focuses on research in information security, spanning both the foundations of cryptography and its applications. In contrast to conventional cryptosystems that only support encryption and decryption, we specialize in advanced technologies such as Secure Multi-party Computation (MPC) and Searchable Encryption.

MPC (also known as secure computation) is a privacy-preserving technology that enables data processing while keeping data encrypted. For example, the figure below shows the use of secure computation to compute statistical data while keeping individual salaries encrypted and private, a crucial requirement for applications such as wage gap surveys. Similarly, searchable encryption enables encrypted data to be searched securely without decryption, which is gaining interest alongside the development of services such as shared cloud storage.

In particular, our group focuses on achieving information-theoretic security using approaches such as secret sharing and hybrid systems, which are important for ensuring security in the post-quantum era. Our research interests also include blockchain, zero-knowledge proofs, card-based cryptography, and, more recently, AI-related security and applications. Currently, we are expanding our scope into emerging fields, including distributed post-quantum encryption/signatures and quantum-based cryptography.