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Isobe Lab
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A lab that studies next-generation security foundations with cryptography at its core.
AboutAbout the lab
Building on cryptography toward a society where security can be quantified
The Isobe Lab studies next-generation security foundations with cryptography at its core.
The lab advances the design of cryptography and the security evaluation of cryptographic systems in actual use, from both theoretical and implementation perspectives.
With the goal of putting research results into practice in society, the lab collaborates with industry, standardization bodies, and the open-source software (OSS) community.
Each student has an independent research theme and advances it through discussions with their advisors and fellow researchers.
Key terms
- Lightweight and low-power cryptography
- Cryptography designed to run lightly and use little power, so that it can be used even on IoT devices with many implementation constraints.
- Cryptography with advanced functionality
- Cryptographic techniques with advanced functionality that conventional public-key cryptography and digital signatures cannot achieve.
- Ring signature
- A digital signature that lets anyone verify that a member of a group signed, without revealing which member it was.
NewsLab news
Paper by Prof. Isobe accepted to IACR Communications in Cryptology
Paper by Associate Professor Hara accepted to IEEE Access
Paper by students and Prof. Isobe accepted to IACR Communications in Cryptology
Paper by students and Prof. Isobe accepted to the international conference IEEE S&P 2027
Paper by students and Prof. Isobe accepted to the international conference ASIACRYPT 2026
ResearchResearch themes
The lab works on the research and development of next-generation security foundations with cryptography at its core. It aims to create cryptographic technologies suited to the Beyond 5G and quantum computing era, and to solve real-world security problems from both theoretical and implementation perspectives.
*Illustrative imageDesign of lightweight, low-power cryptography
The lab develops lightweight, low-power cryptography for IoT devices, which have many implementation constraints, as well as cryptography best suited to cloud environments. Development of high-speed and low-latency cryptography for Beyond 5G is also part of this theme.
*Illustrative imageSecurity evaluation of real-world systems
The lab evaluates the security of widely used products and services, covering protocols, the way cryptography is used, implementations, and operational practices. Past analyses include the end-to-end encryption of LINE and Zoom, and Nostr, a decentralized social networking protocol.
*Illustrative imageCryptography with advanced functionality
The lab studies cryptography with advanced functionality that conventional public-key cryptography and digital signatures cannot achieve. Examples include identity-based encryption and attribute-based encryption, which enable flexible access control, and ring signatures and designated verifier signatures, which guarantee anonymity.
*Illustrative imageCryptographic theory
The lab reconsiders the security models of cryptographic techniques and studies whether particular constructions are possible. It also works on foundational theory using mathematical and computational complexity-theoretic methods, including the analysis of conversions and relationships between cryptographic techniques.
MembersFaculty
The members of the Isobe Lab consist of faculty members, administrative assistants, researchers, project researchers, visiting professors and visiting associate professors, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorTakanori Isobe
- Associate ProfessorKeisuke Hara
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: “VIA Embedded booth security ( )” VIA Gallery from Hsintien, Taiwan / CC BY 2.0 (cropped)
- Design of lightweight, low-power cryptography: “Asymmetric encryption scheme” MarcT0K (icons by JGraph) / CC BY 4.0 (cropped)
- Security evaluation of real-world systems: “Xerox ColorQube 8570 - Main controller - Smart Card-0420” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Cryptography with advanced functionality: “Digital signing” Nicobon / CC BY-SA 4.0 (cropped)
- Cryptographic theory: “Mathematics (cryptography) on a blackboard” David Malone / CC BY 4.0 (cropped)
- Related lab (Shimonishi Lab): “Ice Wireless Building 3G HSPA+ base station tower” Senator88 / CC BY-SA 3.0 (cropped)
- Related lab (Koizumi Lab): “Network-Engineering Ashlan Chidester 36” Cloud899 / CC BY-SA 4.0 (cropped)
- Related lab (Former Hasegawa Lab): “Network-connections” Parkis, Zanaq / CC BY-SA 3.0 (cropped)
- Related lab (Higo Lab): “Pile of light gray LEGO bricks at a LEGO store” Grendelkhan / CC BY-SA 4.0 (cropped)
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