1. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 1 Introduction of Sakurai Lab. Kyushu Univ. JAPAN

2. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 2 Address Department of Computer Science and Communication Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, Fukuoka 812-8581, Japan ITSLAB (Information Technology & Security Laboratory) This building Kyushu Univ.

3. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 3 Topics of Researches Design of Secure Protocols –Key-Exchange Protocol with ID protection (One-time ID) –Fair-Exchange Protocol for E-contract –Secure Data Mining Design of Secure Systems –Anonymity in Peer-to-Peer Network –Privacy of RFID –Combine ID-based Cryptography to PKI –Anti-SPAM Tools for Enhanced Computer Security –Software Obfuscation –Secure OS Tools for Enhanced Network Security –Information Visualization to detect malicious behavior –Detection of Port-Scan

4. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 4 Key-Exchange Protocol Shared Secret  Leakage of User ’ s ID, DoS attack In most existing works, Establish a short-term key to achieve integrity and/or secrecy of following transaction Our approach: introduce One-time ID –Disposable ID used as substitution of (fixed) user's identity How to manage One-time ID ? model privacy and DoS-resiliency ?

5. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 5 Research of Secure RFID (Radio-Frequency Identification) RFID tag is a small and inexpensive microchip that emits an identifier in response to query from nearby reader –Contactless physical-access cards –Automated toll payment –Inventory tags shoe size ○○ yen in wallet price of the suit Privacy concern (linkability, traceability) –We solve it by using universal re-encryption to change information on RFID tags frequently Improve a protocol proposed by Golle et al. (2004) to provide location privacy, and integrity of messages

6. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 6 Privacy Preserving Data Mining  Data Mining –To discover some meaningful predictive information from large volumes of data Technical challenge: –Collaboration of different distributed parties without revealing private data We have developed accurate model without access to precise information in data records –Privacy-preserving two-party K-mean clustering using cryptographic techniques without trusted third party Large Databases…Valuable knowledge found!!

7. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 7 Collaborations ISIT, 2 nd Laboratory, Japan Center of Information Security Technology (CIST), Korea Univ., Korea Chungnam Univ., Korea Gwangju Institute of Science and Technology (GIST), Korea Okayama Univ., Japan Kyushu Institute Univ., Japan Institute for InfocommResearch (I2R), Singapore …

8. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 8 SSR Project (http://www.iisf.or.jp/SSR/) Purpose –Investigation and research of security function of operating system Member –Sakurai Lab. (Kyushu University) –In cooperation with GIST, Korea http://nwcl.gist.ac.kr/~seecure/index.html http://nwcl.gist.ac.kr/~seecure/index.html –Corporation members Fujitsu, Hitachi, IBM, Toshiba, Toshiba Solution

9. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 9 Invited Researchers (2004-2005) CIST members –Prof. Jongin Lim, Prof. Donghoon Lee, Yong Ho Kim, Jeong Jae Yu, Tae Hyun Kim, Hwa Yean Lee, … GIST members –Jongyoul Park, Wook Shin, Hyung Chan Kim, Hyunjin Yoo, Jiho Cho Prof. Man Young Rhee (Kyung Hee Univ.) Prof. Mridul Nandi (Indian Statistical Institute) Prof. Hyang-Sook Lee (Ewha Womans Univ.) Dr. Guilin Wang (I2R) …

10. KYUSHUUNIVERSITYKYUSHUUNIVERSITY SAKURAILABORATORYSAKURAILABORATORY 10 Website of ITSLAB http://itslab.csce.kyushu-u.ac.jp