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Yasunaga Lab
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A lab that examines cryptography and error-correcting codes through the lens of mathematics.
AboutAbout the lab
Looking at cryptography and computation mathematically
The Yasunaga Lab studies a range of techniques in theoretical computer science, including cryptography and error-correcting codes.
The lab explores the boundary between what can and cannot be achieved when computation is expressed mathematically.
It also covers foundational questions such as how to measure the security of cryptographic schemes, and approaches to security based on game theory.
Research topics are decided through discussion between students and faculty members.
Key terms
- Cryptography
- The field that mathematically treats methods for keeping information from being read by others, and the security of those methods
- Error-correcting codes
- A mechanism that adds redundant information to data so that it can be restored even if errors occur along the way
- Computational complexity theory
- The field that studies how much computational effort is needed to solve a given problem
NewsLab news
View More ↗ResearchResearch themes
The lab explores the boundary between what is and is not achievable in techniques of theoretical computer science such as cryptography and error-correcting codes. The main themes are the foundations of cryptography, cryptographic protocols with game-theoretic security, and error-correcting codes. Computational complexity theory, information theory, and quantum information are also within its interests.
*Illustrative imageFoundations of cryptography
The lab studies fundamental aspects of cryptography. It has given bit security, a measure of the strength of security, a framework as a quantity with operational meaning. It is also interested in how existing security analyses should be revisited when the way of measuring the distance between distributions is changed.
*Illustrative imageCryptographic protocols through game theory
Participants in cryptographic protocols are often modeled as either honest parties who follow the rules or adversaries who disrupt them. Between these two, the lab considers players who behave rationally in the game-theoretic sense, aiming at techniques that realize cryptographic protocols at low cost.
*Illustrative imageError-correcting codes
An error-correcting code is a mechanism in which, if the encoded strings are far apart from one another, the original string can be recovered even when errors occur. The lab is interested in methods that use cryptographic techniques to enhance correction capability, code design using expander graphs, and the design of codes that are robust against quantum noise.
MembersFaculty
The members of the Yasunaga Lab consist of faculty members and students.As of 2026
- Associate ProfessorKenji YasunagaPublications ↗
VoicesStudent voices
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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: “ENIGMA Wired Rotor - National Cryptologic Museum - DSC07768” Daderot / CC0 (cropped)
- Foundations of cryptography: “Enigma Machine A16672 open.agr” ArnoldReinhold / CC BY-SA 4.0 (cropped)
- Cryptographic protocols through game theory: “PayoffMatrixForwiki” נעמ״ה / CC0 (cropped)
- Error-correcting codes: “CDs, Seitenansicht” Dietmar Rabich / CC BY-SA 4.0 (cropped)
- Related lab (田中圭介研究室): “RED cipher machine detail.agr” ArnoldReinhold / CC BY-SA 4.0 (cropped)
- Related lab (七島幹人研究室): “Turing Machine Model Davey 2012” Rocky Acosta / CC BY 3.0 (cropped)
- Related lab (荒井迅研究室): “Poisson saturne revisited” Bvsydow / CC BY-SA 4.0 (cropped)
- Related lab (田中健一郎研究室): “Domain coloring x2-1 x-2-i x-2-i d x2+2+3i” Djiboun / CC BY-SA 4.0 (cropped)
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