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Tanaka Lab
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A cryptography lab that approaches information security through mathematics.
AboutAbout the lab
Information security from a mathematical perspective.
The Tanaka Lab approaches information security from a mathematical perspective.
Information security means protecting the safety of information and communication networks.
Specifically, the lab covers cryptography, cryptocurrency and blockchain technology, and cybersecurity.
Cryptography is also closely related to computational complexity theory, information theory, and number theory.
Key terms
- Public-key cryptography
- A method that separates the public key used for encryption from the private key used for decryption. The public key is placed where anyone can see it.
- Digital signature
- A technology that attaches the equivalent of an approval seal to an electronic document. It must be impossible to forge.
- Post-quantum cryptography
- A field aiming at public-key cryptography that cannot be broken even once quantum computers are realized.
ResearchResearch themes
The lab approaches information security from a mathematical perspective and covers cryptography, cryptocurrency and blockchain technology, and cybersecurity. Cryptography ranges from theoretical topics such as security proofs to applied topics such as fast computer implementations.
*Illustrative imageSecurity of public-key cryptography
Public-key cryptography is a method that encrypts and decrypts using two keys, a public key and a private key. The lab studies which public-key cryptosystems satisfy which security properties.
*Illustrative imageSecurity of digital signatures
Simply attaching an image of a personal seal to a document allows unlimited forgery. A signature on a document is called secure when it cannot be forged, and the lab studies which schemes satisfy which security properties.
*Illustrative imageQuantum cryptography and post-quantum cryptography
Once quantum computers are realized, most of the public-key cryptosystems widely used today, including RSA, will be broken. The lab studies public-key cryptography that remains secure after that, as well as cryptographic protocols that use quantum principles.
MembersFaculty
The members of the Tanaka Lab consist of faculty members, doctoral, master's, and undergraduate students, and non-degree research students.As of 2025
- ProfessorKeisuke TanakaPublications ↗
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: “RED cipher machine detail.agr” ArnoldReinhold / CC BY-SA 4.0 (cropped)
- Security of public-key cryptography: “Small padlock with three keys in Holma Marina” W.carter / CC BY-SA 4.0 (cropped)
- Security of digital signatures: “Wax seal with impression of uppercase letter A” en:User:Contrafool / CC BY-SA 3.0 (cropped)
- Quantum cryptography and post-quantum cryptography: “Quantum Computer with Dark Background 001” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (松浦知史研究室): “SZTE-JATIK, switch” Xbspiro / CC BY-SA 3.0 (cropped)
- Related lab (安永憲司研究室): “ENIGMA Wired Rotor - National Cryptologic Museum - DSC07768” Daderot / CC0 (cropped)
- Related lab (七島幹人研究室): “Turing Machine Model Davey 2012” Rocky Acosta / CC BY 3.0 (cropped)
- Related lab (叢悠悠研究室): “Lambda calculus-Church numerals” Isaac David / Public domain (cropped)
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