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Cyber Security Engineering Lab
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A lab that studies privacy protection and system security with cryptography at its core.
AboutAbout the lab
Advancing information security technology with cryptography at its core
The Cyber Security Engineering Lab studies information security technologies centered on cryptography, as well as technologies that protect privacy.
Beyond producing theoretical results, the lab also conducts joint research with companies aiming at practical use.
In training researchers, the lab works to develop broad knowledge of security, problem-solving ability, and presentation skills.
On the lab's website, it is introduced under the name "Miyaji Lab."
Key terms
- PDDI
- A system that integrates data while preserving privacy, leaving the data distributed across institutions.
- Post-quantum cryptography
- Cryptography that is secure even against quantum computers. RSA and elliptic curve cryptography can be broken by quantum computers.
- Cryptanalysis
- Research that looks for weaknesses in ciphers and attempts to break them. Advances in cryptanalysis are considered essential for guaranteeing the security of cryptography.
NewsLab news
A paper by Distinguished Professor Miyaji and others was published in IEEE Transactions on Information Theory
Assistant Professor Shinya received the CSEC Outstanding Research Award (Special Interest Group on Computer Security (CSEC))
Professor Atsuko Miyaji was awarded the Medal with Purple Ribbon in autumn 2024 (Reiwa 6)
Lecturer Tarutani received the Engineering Education Award, Paper and Editorial Category (Japanese Society for Engineering Education)
Lab members received the Best Paper Award at the 19th AsiaJCIS
ResearchResearch themes
Based on cryptographic technology, the lab studies technologies for operating the various systems of an electronic society securely. Its research themes cover a wide range, including privacy protection, post-quantum cryptography, cryptanalysis, blockchain, and dependable system software.
Privacy-Preserving Data Integration
The lab aims to realize an integration system (PDDI) that can match and analyze data distributed across institutions such as schools, fire departments, and hospitals while preserving privacy, without gathering the data in one place.
*Illustrative imageResearch on Cryptography Resistant to Quantum Computers
On post-quantum cryptography, which is secure even against quantum computers, the lab works on realizing functions of lattice-based and isogeny-based cryptography, improving efficiency in processing speed and memory usage, and conducting experimental and theoretical security analysis.
*Illustrative imageFinding Weaknesses by Cryptanalysis
The lab performs cryptanalysis of ChaCha, a cipher that is a global standard in TLS, and of Salsa, its predecessor. By analyzing biases in large amounts of ciphertext, it finds new vulnerabilities and clarifies the conditions for designing stronger ciphers.
*Illustrative imageApplications and Improvements of Blockchain
The lab works on building trustworthy digital systems using blockchain, realizing blockchains that can be edited securely by means of chameleon hashes, and strengthening security against various attacks.
MembersFaculty
The members of the Miyaji Lab consist of faculty, visiting professors and visiting associate professors, part-time lecturers, assistants, doctoral, master's, and undergraduate students, and research students.As of 2025
- Distinguished ProfessorAtsuko Miyaji
- LecturerYuya Tarutani
- Assistant ProfessorShinya Shinya
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Computer locked” Juan Pablo Olmo / CC BY 2.0 (cropped)
- Research on Cryptography Resistant to Quantum Computers: “Padlock with lattice background” M. B., Jr. / CC BY-SA 4.0 (cropped)
- Finding Weaknesses by Cryptanalysis: “RED cipher machine.agr” ArnoldReinhold / CC BY-SA 4.0 (cropped)
- Applications and Improvements of Blockchain: “Blockchain books Donner Rotterdam 22 Dec 2017” Someone Not Awful / CC BY-SA 4.0 (cropped)
- Related lab (Photonic Network Engineering Lab): “SRNL Fiber Optic Cable Installation ( )” Savannah River Site / Public domain (cropped)
- Related lab (Intelligent Integrated Systems Lab [Graduate School of Information Science and Technology]): “MC705 microcontroller ( )” Sergey G from Russia / CC BY 2.0 (cropped)
- Related lab (Data Generation Engineering Lab): “Aerial View of a city in night” Chinmayee Mishra / CC BY-SA 4.0 (cropped)
- Related lab (Sensing Systems Lab): “CASBV radar de Blainville antenne” Pierre cb / CC BY-SA 4.0 (cropped)
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