Selected Publications in English

Books

[1]

Dongho Won and Seungjoo Kim (Ed.),
"Information Security and Cryptology - ICISC 2005: 8th International Conference, Seoul, Korea, December 1-2, 2005. Proceedings",
Springer-Verlag, LNCS 3935, 2006. pp.1-455.

Journal Papers

[27]

Yunho Lee, Sangjoon Park, Masahiro Mambo, Seungjoo Kim, and Dongho Won,
"Towards Trustworthy e-Voting using Paper Receipts (.pdf)",
Elsevier Computer Standards & Interfaces, Vol.?, No.?, 2010, Accepted for Publication. (SCI-E, SCOPUS)

[26]

Yongwook Kim, Yunho Lee, Seungjoo Kim, and Dongho Won,
"The Improved OSPA Protocol Against Impersonation Attack (.pdf)",
Journal of Computer and Systems Sciences International, Vol.?, No.?, 2010, Accepted for Publication. (SCI-E, SCOPUS)

[25]

Donghyun Choi, Sungjin Lee, Dongho Won, and Seungjoo Kim
"Efficient Secure Group Communications for SCADA (.pdf)",
IEEE Transactions on Power Delivery, Vol.?, No.?, 2010, Accepted for Publication. (SCI, SCOPUS)

[24]

Hanjae Jeong, Dongho Won, Seungjoo Kim,
"Weaknesses and Improvement of Secure Hash-Based Strong-Password Authentication Protocol (.pdf)",
Journal of Information Science and Engineering, Vol.26, No.5, September 2010, Accepted for Publication. (SCI-E, SCOPUS)

[23]

Yunho Lee, Seungjoo Kim, Dongho Won,
"Enhancement of two-factor authenticated key exchange protocols in public wireless LANs (.pdf)",
Elsevier Computers and Electrical Engineering, Volume 36, Issue 1, January 2010, pp.213-223. (SCI-E)

[22]

Mijin Kim, Byunghee Lee, Seungjoo Kim, and Dongho Won,
"Weaknesses and Improvements of a One-time Password Authentication Scheme (.pdf)",
SERSC : International Journal of Future Generation Communication and Networking, Vol.2, No.4, December 2009, pp.29-38.

[21]

Donghyun Choi, Hakman Kim, Dongho Won, and Seungjoo Kim,
"Advanced Key Management Architecture for Secure SCADA Communications (.pdf)",
IEEE Transactions on Power Delivery, Vol.24, No.3, July 2009, pp.1154-1163. (SCI, SCOPUS)

[20]

Junghyun Nam, Youngsook Lee, Seungjoo Kim, and Dongho Won,
"Security Weakness in a Three-Party Pairing-Based Protocol for Password Authenticated Key Exchange (.pdf)",
Information Sciences, Volume 177, Issue 6, Elsevier Science Inc, 15 March 2007, pp.1364-1375. (SCI, IF:2.147)

[19]

Junghyun Nam, Seungjoo Kim, Sangjoon Park, and Dongho Won,
"Security Analysis of a Nonce-Based User Authentication Scheme Using Smart Cards (.pdf)",
IEICE Trans. Fundamentals, Vol.E90-A, No.1, January 2007, pp.299-302. (SCI-E, IF:0.287)

[18]

Yunho Lee, Seungjoo Kim, and Dongho Won,
"Weakness and Improvements of Yong-Lee's Anonymous Fingerprinting Protocol (.pdf)",
IEICE Trans. Fundamentals, Vol.E89-A, No.7, July 2006, pp.2084-2087. (SCI-E, IF:0.312)

[17]

Jaeil Lee, Jong Wook Park, Seungjoo Kim, and JooSeok Song,
"PEPSI (Privacy-Enhanced Permanent Subject Identifier) Embedded in X.509 Certificate",
IJCSNS, International Journal of Computer Science and Network Security, Vol.6, No.6, 30 June, 2006, pp.204-208.

Note : See also the IETF standard, "RFC 4683 : Internet X.509 Public Key Infrastructure Subject Identification Method (SIM)", October 10, 2006.

[16]

Hyunjue Kim, Seungjoo Kim, and Dongho Won,
"Cryptanalysis of Sui et al.'s Second ID-based Key Issuing Protocol without Key Escrow (.pdf)",
IJCSNS, International Journal of Computer Science and Network Security, Vol.6, No.1, 30 January, 2006, pp.247-250.

[15]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Weakness in Jung et al.'s ID-Based Conference Key Distribution Scheme (.pdf)",
IEICE Trans. Fundamentals, Vol.E89-A, No.1, January 2006, pp.213-218. (SCI-E, IF:0.312)

[14]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Attack on the Sun-Chen-Hwang's Three-Party Key Agreement Protocols using Passwords (.pdf)",
IEICE Trans. Fundamentals, Vol.E89-A, No.1, January 2006, pp.209-212. (SCI-E, IF:0.312)

[13]

Jin Kwak, Keunwoo Rhee, Seungjoo Kim, and Dongho Won,
"Unlinkable and Traceable EPC System for Consumer Privacy (.pdf)",
IJCSNS, International Journal of Computer Science and Network Security, Vol.5, No.12, 30 December, 2005, pp.75-81.

[12]

Younggyo Lee, Jeonghee Ahn, Seungjoo Kim, and Dongho Won,
"A Method for Detecting the Exposure of an OCSP Responder's Private Key using One-Time Hash Value (.pdf)",
IJCSNS, International Journal of Computer Science and Network Security, Vol.5, No.8, 30 August, 2005, pp.179-186.

[11]

Junghyun Nam, Woosuk Chang, Jeeyeon Kim, Seungjoo Kim, and Dongho Won,
"A Provably Secure Key Exchange Scheme for Dynamic Groups (.pdf)",
IJCSNS, International Journal of Computer Science and Network Security, Vol.5, No.8, 30 August, 2005, pp.134-145.

[10]

Junghyun Nam, Jinwoo Lee, Seungjoo Kim, and Dongho Won,
"DDH-based Group Key Agreement in a Mobile Environment (.pdf)",
Journal of Systems and Software, Volume 78, Issue 1, Elsevier Science Inc, October 2005, pp.73-83. (SCI-E, IF:0.744)

[9]

Seungjoo Kim and Dongho Won
"Privacy-Enhanced Public-Key Certificate: How to Embed an Individual's Sensitive Information into a Certificate (.pdf)",
Trends in Mathematics (Electronic Journal ), Vol.8, No.1, ICMS(Information Center for Mathematical Science), June 2005, pp.21-28.

[8]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"A Weakness in the Bresson-Chevassut-Essiari-Pointcheval's Group Key Agreement Scheme for Low-Power Mobile Devices" (.pdf),
IEEE Communications Letters, Volume 9, Issue 5, May 2005, pp.429-431. (SCI, IF:1.058)

[7]

Junghyun Nam, Jinwoo Lee, Sungduk Kim, Seungjoo Kim, and Dongho Won,
"Provably-Secure and Communication-Efficient Protocol for Dynamic Group Key Exchange (.pdf)",
Journal of the KIISC (Korean Institute of Information Security and Cryptology), Vol.14/No.4, August 2004, pp.163-181.

[6]

Kilsoo Chun, Seungjoo Kim, Sangjin Lee, Soo Hak Sung, and Seonhee Yoon,
"Differential and Linear Cryptanalysis for 2-round SPNs (.pdf)",
Information Processing Letters, Volume 87, Issue 5, Elsevier, 15 September 2003, pp.277-282 (SCI-E, IF:0.473)

[5]

Sung-Ming Yen, Seungjoo Kim, Seongan Lim, and SangJae Moon,
"RSA Speedup with Chinese Remainder Theorem Immune against Hardware Fault Cryptanalysis (.pdf)",
IEEE Transactions on Computers - Special issue on CHES, Vol.52, No.4, April 2003, pp.461-472. (SCI, IF:1.919)

[4]

Seungjoo Kim, Seongan Lim, and Dongho Won,
"Cryptanalysis of flexible remote password authentication scheme of ICN'01 (of Springer LNCS 2093) (.pdf)",
Electronics Letters 38(24), IEE Press, 21 November 2002, pp.1519-1520. (SCI, IF:1.072)

[3]

Seungjoo Kim, Masahiro Mambo, Takeshi Okamoto, Hiroki Shizuya, Mitsuru Tada and Dongho Won,
"On the security of the Okamoto-Tanaka ID-based key exchange scheme against active attacks (.pdf)", (Click here for conference version),
IEICE Trans. Fundamentals, Vol.E84-A, No.1, January 2001, pp.231-238. (SCI-E, IF:0.346)

Note : See also helpful graphics from Hiroki Shizuya's web.

[2]

Seungjoo Kim, Byungchun Kim and Sungjun Park,
"Comments on password-based private key download protocol of NDSS'99 (.pdf)" (Click here for Sung-Ming Yen's revised version),
Electronics Letters 35(22), IEE Press, 7 September 1999, pp.1937-1938. (SCI, IF:1.164)

Note : See also helpful graphics from ISI.

[1]

Sangjoon Park, Seungjoo Kim and Dongho Won,
"ID-based group signature (.pdf)",
Electronics Letters 33(19), IEE Press, 11 September 1997, pp.1616-1617. (SCI, IF:1.005)

Note : The algorithms in this paper have been broken by W.Mao and revised (in Korean) by the authors.

Conference Papers

[84]

Mijin Kim, Byunghee Lee, Seungjoo Kim, Dongho Won,
"Weaknesses and Improvements of Kuo-Lee's One-time Password Authentication Scheme (.pdf)",
Proc. of FGCN/ACN 2009, International Conference on Future Generation Communication and Networking 2009, Springer-Verlag, Communications in Computer and Information Science 56, Jeju, Korea, December 10-12, 2009, pp.421-430.

[83]

Hyunseung Lee, Donghyun Choi, Yunho Lee, Dongho Won, Seungjoo Kim,
"Cryptanalysis of two-factor authenticated key exchange protocol in Public Wireless LANs (.pdf)",
Proc. of ICCNS 2009, International Conference on Computer Networks and Security 2009, Bali, Indonesia, November 25-27, 2009, pp.194-197.

[82]

Hyoungseob Lee, Donghyun Choi, Yunho Lee, Dongho Won, Seungjoo Kim,
"Security Weaknesses of Dynamic ID-based Remote User Authentication Protocol (.pdf)",
Proc. of ICCNS 2009, International Conference on Computer Networks and Security 2009, Bali, Indonesia, November 25-27, 2009, pp.190-193.

[81]

Hyunsang Park, Kwangwoo Lee, Yunho Lee, Seungjoo Kim, Dongho Won,
"Security Analysis on the Online Office and Proposal of the Evaluation Criteria (.pdf)",
Proc. of ICCNS 2009, International Conference on Computer Networks and Security 2009, Bali, Indonesia, November 25-27, 2009, pp.198-204.

[80]

Songyi kim, Kwangwoo Lee, Seungjoo Kim, Dongho Won,
"Security Analysis on Anonymous Mutual Authentication Protocol for RFID Tag without Back-End Database and Its Improvement (.pdf)",
Proc. of ICCNS 2009, International Conference on Computer Networks and Security 2009, Bali, Indonesia, November 25-27, 2009, pp.460-464.

[79]

Sungkyu Cho, Donghwi Shin, Heasuk Jo, Donghyun Choi, Dongho Won, Seungjoo Kim,
"A Practical approaches to Code Encryption Method against Reverse Engineering (.pdf)",
Proc. of ICCNS 2009, International Conference on Computer Networks and Security 2009, Bali, Indonesia, November 25-27, 2009, pp.151-158.

[78]

Heasuk Jo, Yunho Lee, Mijin Kim, Seungjoo Kim, Dongho Won,
"Off-line Password-guessing Attack to Yang's and Huang's Authentication Schemes (.pdf)",
Proc. of NCM 2009, International Joint Conference on INC, IMS and IDC 2009, Seoul, Korea, August 25-27, 2009, pp.618-621.

[77]

Mijin Kim, Heasuk Jo, Seungjoo Kim, Dongho Won,
"Security Weakness in a Provable Secure Authentication Protocol Given Forward Secure Session Key (.pdf),"
Proc. of ICCSA 2009, The International Conference on Computational Science and Its Applications 2009, Springer-Verlag, LNCS 5593, Yongin, Korea, June 29 - July 2, 2009, pp.204-211. (SCOPUS)

[76]

Kwangwoo Lee, Yunho Lee, Seungjoo Kim, Dongho Won,
"A Practical Approach to a Reliable Electronic Election (.pdf),"
Proc. of ICCSA 2009, The International Conference on Computational Science and Its Applications 2009, Springer-Verlag, LNCS 5593, Yongin, Korea, June 29 - July 2, 2009, pp.191-203. (SCOPUS)

[75]

Wansuck Yi, Seungjoo Kim, Dongho Won,
"Smart card based AKE Protocol using Biometric Information in Pervasive Computing Environment (.pdf),"
Proc. of ICCSA 2009, The International Conference on Computational Science and Its Applications 2009, Springer-Verlag, LNCS 5593, Yongin, Korea, June 29 - July 2, 2009, pp.182-190. (SCOPUS)

[74]

Heasuk Jo, Woongryul Jeon, Yunho Lee, Seungjoo Kim, Dongho Won,
"Security Specification for Conversion Technologies of Heterogeneous DRM Systems (.pdf),"
Proc. of ISPEC 2009, Information Security Practice and Experience Conference 2009, Springer-Verlag, LNCS 5451, Xi'an, China, April 13-15, 2009, pp.159-170. (SCOPUS) (Acceptance Ratio: 23%)

[73]

Yunyoung Lee, Soonhaeng Hur, Dongho Won, and Seungjoo Kim,
"Cipher Suite Setting Problem of SSL Protocol and It's Solutions (.pdf),"
Proc. of FINA 2009, The Fifth International Symposium on Frontiers of Information Systems and Network Applications 2009, Bradford, UK, May 26-29, 2009, pp.140-146. (Acceptance Ratio: ??%)

[72]

Jeonghoon Han, Dongho Won and Seungjoo Kim,
"New Identity Management Scheme and Its Formal Analysis (.pdf),"
Proc. of WASET 2009, World Academy of Science, Engineering and Technology 2009, Volume 49, Dubai, United Arab Emirates, January 28-29, 2009, pp.617-623. (Acceptance Ratio: 25%)

[71]

Sumin Hong, Woongryul Jeon, Seungjoo Kim, Dongho Won, and Choonsik Park
"The Vulnerabilities analysis of Fuzzy Vault using Password (.pdf),"
Proc. of BSBT 2008, The International Conference on Bio-Science and Bio-Technology 2008, IEEE Computer Society, Volume III, Hainan Island, China, December 13-15, 2008, pp.76-83. (Acceptance Ratio: 24%)

[70]

Sungjin Lee, Donghyun Choi, Choonsik Park, and Seungjoo Kim,
"An Efficient Key Management Scheme for Secure SCADA Communication (.pdf),"
Proc. of ICPEPE 2008, International Conference on Power Electronics and Power Engineering 2008, Laval, France, November 21-23, 2008, pp.458-464. (Acceptance Ratio: 20%)

[69]

Yunho Lee, Seungjoo Kim, and Dongho Won,
"How to Trust DRE Voting Machines Preserving Voter Privacy (.pdf),"
Proc. of IEEE ICEBE 2008, International Conference on e-Business Engineering 2008, IEEE Computer Society, Xi'AN, China, October 22-24, 2008, pp.302-307.

[68]

Donghyun Choi, Sungkyu Cho, Dongho Won, and Seungjoo Kim,
"Protection Profile for Connected Interoperable DRM Framework (.pdf),"
Proc. of WISA 2008, International Workshop on Information Security Applications, Springer-Verlag, LNCS 5379, Jeju Island, Korea, September 23-25, 2008, pp.320-332. (SCOPUS) (Acceptance Ratio: 14.3%)

[67]

Kwangwoo Lee, Yunho Lee, Woongryul Jeon, Dongho Won and Seungjoo Kim,
"Protection Profile for E-Voting Systems (.ppt)",
Proc. of ICCC 2008, 9th International Common Criteria Conference, on CD-ROM, Jeju, Korea, September 23-25, 2008.

[66]

Namje Park, Dooho Choi, Seungjoo Kim, and Dongho Won,
"Enforcing Security in Mobile RFID Networks: Multilateral Approaches and Solutions (.pdf),"
Proc. of IEEE/IFIP NOMS 2008, The 11th IEEE/IFIP Network Operations & Management Symposium 2008, IEEE Computer Society, Salvador, Brazil, April 7-11, 2008, pp.999-1002.

[65]

Hanjae Jeong, Younsung Choi, Woongryel Jeon, Fei Yang, Yunho Lee, Seungjoo Kim, and Dongho Won,
"Vulnerability Analysis of Secure USB Flash Drives (.pdf),"
Proc. of IEEE MTDT 2007, The 15th IEEE International Workshop on Memory Technology, Design and Testing 2007, IEEE Computer Society, Taipei, Taiwan., December 3-5, 2007, pp.61-64.

[64]

Donghwi Shin, Youngsung Choi, Yunho Lee, Sangjoon Park, Seungjoo Kim and Dongho Won,
"Security Analysis on the Authentication Mechanisms of Korean Popular Messengers (.pdf)",
Proc. of HCI International 2007, 12th International Conference on Human-Computer Interaction, Springer-Verlag, LNCS 4554, Beijing, P.R.China, July 22-27, 2007, pp.547-552.

[63]

Donghyun Choi, Yunho Lee, Hogab Kang, Seungjoo Kim, and Dongho Won,
"An Efficient and Secure Rights Sharing Method for DRM System Against Replay Attack (.pdf)",
Proc. of ATC-07, The 4th International Conference on Autonomic and Trusted Computing, Springer-Verlag, LNCS 4610, Hong Kong, China, July 11-13, 2007, pp.135-145. (Acceptance Ratio: 24.6%)

[62]

Namje Park, Seungjoo Kim, and Dongho Won,
"Privacy Preserving Enhanced Service Mechanism in Mobile RFID Network (.pdf),"
Proc. of AWIC 2007, The 5th Atlantic Web Intelligence Conference, Springer-Verlag, Advances in Soft Computing 43, Fontainebleau, France, June 25-27, 2007, pp.278-283.

[61]

Younggyo Lee, Jeonghee Ahn, Seungjoo Kim, Dongho Won,
"A Countermeasure of Fake Root Key Installation using One-Time Hash Chain (.pdf)",
Proc. of KES AMSTA 2007, KES Symposium on Agent and Multi-Agent Systems, Springer-Verlag, LNCS 4496, Wroclaw, Poland, May 31 - June 1, 2007, pp.1007-1016. (Acceptance Ratio: 25.86%)

[60]

Hanjae Jeong, Kwangwoo Lee, Seungjoo Kim, and Dongho Won,
"Analysis of Composed TOE in the Common Criteria 3.1",
The First International Conference on Ubiquitous Information Management and Communication 2007, Suwon, Korea, February 8-9, 2007, pp.500-504.

[59]

Yunyoung Lee, Donghwi Shin, Kwangwoo Lee, Seungjoo Kim, and Dongho Won,
"The Threat Modeling and Choosing the Better Countermeasure",
The First International Conference on Ubiquitous Information Management and Communication 2007, Suwon, Korea, February 8-9, 2007, pp.174-181.

[58]

Sungjin Lee, Seokhyun Jang, Yongwook Kim, Donghyun Choi, Seungjoo Kim, and Dongho Won,
"Mobile P2P Group Communication Protocol for Confidence and Anonymity",
The First International Conference on Ubiquitous Information Management and Communication 2007, Suwon, Korea, February 8-9, 2007, pp.166-173.

[57]

Sangjoon Park, Junghyun Nam, Seungjoo Kim and Dongho Won,
"New Efficient Password-Authenticated Key Exchange Based on RSA (.pdf)",
Proc. of CT-RSA 2007, Cryptographers' Track RSA Conference, Springer-Verlag, LNCS 4377, San Francisco, February 5-9, 2007, pp.309-323. (Acceptance Ratio: 34.24%)

[56]

Younsung Choi, Younggyo Lee, Junghyun Nam, Yunho Lee, Sangjoon Park, Seungjoo Kim, Dongho Won,
"A Recovery Method of the Deleted Certificate and the Private-Key Encryption Password using Commercial Forensic Tools",
Proc. of APIS 2007, The 6th Asia Pacific International Symposium on Information Technology 2007, Kuala Lumpur, Malysia, January 20-23, 2007, pp.201-204.

[55]

Jeeyeon Kim, Seungjoo Kim, Kilsoo Chun, Jaeil Lee, and Dongho Won,
"Group Key Agreement Protocol Among Mobile Devices in Different Cells (.pdf)",
Proc. of ISPA 2006 Ws, International Symposium on Parallel and Distributed Processing and Applications, Springer-Verlag, LNCS 4331, Sorrento, Italy, 1-4 December, 2006, pp.1090-1097. (Acceptance Ratio: 31.57%)

[54]

Woosuk Chang, Hyunjue Kim, Junghyun Nam, Seokhyang Cho, Yunho Lee, Hogab Kang, Dongho Won, Seungjoo Kim,
"New Pay-TV Conditional Access System Using A Group Key Agreement Protocol (.pdf)",
Proc. of ICHIT 2006, International Conference on Hybrid Information Technology, Springer-Verlag, LNCS ????, Cheju Island, Korea, November 9-11, 2006, pp.?-?. (Acceptance Ratio: 20.84%)

[53]

Keunwoo Rhee, Jin Kwak, Wansuk Lee, Chanho Park, Sangjoon Park, Hyungkyu Yang, Seungjoo Kim, Dongho Won,
"Efficient RFID Authentication Protocol for Minimizing RFID Tag Computation (.pdf)",
Proc. of ICHIT 2006, International Conference on Hybrid Information Technology, Springer-Verlag, LNAI 4413, Cheju Island, Korea, November 9-11, 2006, pp.607-616. (Acceptance Ratio: 20.84%)

[52]

Yunho Lee, Heasuk Jo, Seungjoo Kim, and Dongho Won,
"An Efficient Dispute Resolving Method for Digital Images (.pdf)",
Proc. of IS 2006, International Workshop on Information Security (in conjunction with OTM 2006), Springer-Verlag, LNCS 4277, Montpellier, France, October 30 - November 1, 2006, pp.331-341. (Acceptance Ratio: 28.91%)

[51]

Namje Park, Jin Kwak, Seungjoo Kim, Dongho Won, and Howon Kim,
"Security Techniques Based on EPC Gen2 Tag for Secure Mobile RFID Network Services (.pdf)",
Proc. of KES 2006, 10th International Conference on Knowledge-Based Intelligent Information and Engineering Systems, Springer-Verlag, LNAI 4251, Bournemouth, UK, October 9-11, 2006, pp.924-934. (SCI-E, Acceptance Ratio: 34%)

[50]

Namje Park,, Seungjoo Kim, Dongho Won, and Howon Kim,
"Security Analysis and Implementation leveraging Globally Networked Mobile RFIDs (.pdf)",
Proc. of PWC 2006, IFIP TC6 11th International Conference on Personal Wireless Communications, Springer-Verlag, LNCS 4217, Albacete, Spain, Sep 20-22, 2006, pp.494-505. (SCI-E, Acceptance Ratio: 24%)

[49]

Jin Kwak, Keunwoo Rhee, Namje Park, Howon Kim, Seungjoo Kim, Kouichi Sakurai, Dongho Won,
"RFID system based MCLT system with Improved Privacy (.pdf)",
Proc. of Trust 2006, Trustworthiness, Reliability and services in Ubiquitous and Sensor neTworks, Springer-Verlag, LNCS 4097, Seoul, Korea, August 1-4, 2006, pp.579-590. (SCI-E, Acceptance Ratio: 27%)

[48]

Yunho Lee, Kwangwoo Lee, Seungjoo Kim, and Dongho Won,
"Efficient Voter Verifiable E-Voting Schemes with Cryptographic Receipts",
Proc. of WOTE 2006, IAVoSS Workshop On Trustworthy Elections (in conjunction with the 6th Workshop on Privacy Enhancing Technologies), Robinson College, Cambridge, United Kingdom, June 28-30, 2006, pp.145-152.

[47]

Younggyo Lee, Jeonghee Ahn, Seungjoo Kim, and Dongho Won,
"A PKI System for Detecting the Exposure of a User's Secret Key (.pdf)",
Proc. of EuroPKI 2006, European PKI Workshop: Research and Applications, Springer-Verlag, LNCS 4043, Politecnico di Torino, Sala Consiglio di Facolta, Torino (Italy), June 19 - 20, 2006, pp.248-250. (SCI-E, Acceptance Ratio: 44%)

[46]

Youngsook Lee, Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Two Efficient and Secure Authentication Schemes Using Smart Cards (.pdf)",
Proc. of ICCSA 2006, International Conference on Computational Science and Its Applications, Springer-Verlag, LNCS 3984, The Hilton Glasgow Hotel, Glasgow, UK, May 8-11, 2006, pp.858-866. (SCI-E, Acceptance Ratio: 27.10%)

[45]

He Zheng, Jin Kwak, Kyungho Son, Wansuk Lee, Seungjoo Kim, and Dongho Won,
"Confidence Value based Multi Levels of Authentication for Ubiquitous Computing Environments (.pdf)",
Proc. of ICCSA 2006, International Conference on Computational Science and Its Applications - Authentication Authorization Accounting (AAA) Workshop, Springer-Verlag, LNCS 3981, The Hilton Glasgow Hotel, Glasgow, UK, May 8-11, 2006, pp.954-963. (SCI-E, Acceptance Ratio: 27.10%)

[44]

Namje Park, Jin Kwak, Seungjoo Kim, Dongho Won, and Howon Kim,
"WIPI Mobile Platform with Secure Service for Mobile RFID Network Environment (.pdf)",
Proc. of ICSE 2006, International Workshop on Web-based Internet Computing for Science and Engineering (in conjunction with APWeb 2006), Springer-Verlag, LNCS 3842, Harbin, China, January 18, 2006, pp.741-748. (SCI-E, Acceptance Ratio: 9%)

[43]

Yunho Lee, Kwangwoo Lee, Seungjoo Kim, Dongho Won, and Hyungkyu Yang,
"A Method for Deciding Quantization Steps in QIM Watermarking Schemes (.pdf)",
Proc. of SecUbiq 2005, International Workshop on Security in Ubiquitous Computing Systems (in conjunction with EUC 2005), Springer-Verlag, LNCS 3823, Nagasaki, Japan, December 6-9, 2005, pp.965-975. (SCI-E, IF:0.402)

[42]

Namje Park, Kiyoung Moon, Kyoil Chung, Seungjoo Kim, and Dongho Won,
"XML-Based Digital Signature Accelerator in Open Mobile Grid Computing (.pdf)",
Proc. of GCC 2005, International Conference on Grid and Cooperative Computing, Springer-Verlag, LNCS 3795, Beijing, China, November 30 - December 3, 2005, pp.323-333. (SCI-E, IF:0.402)

[41]

Hyunjue Kim, Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Secure and Efficient ID-based Group Key Agreement fitted for Pay-TV (.pdf)",
Proc. of PCM 2005, The 2005 Pacific-Rim Conference on Multimedia, Springer-Verlag, LNCS 3768, Jeju Island, Korea, November 13-16, 2005, pp.117-128. (SCI-E, IF:0.402)

[40]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Secure Group Communications over Combined Wired and Wireless Networks (.pdf)",
Proc. of TrustBus 2005, International Conference on Trust, Privacy, and Security in Digital Business (in conjunction with DEXA 2005), Springer-Verlag, LNCS 3592, Copenhagen, Denmark, August 22-26, 2005, pp.90-99. (SCI-E, IF:0.402)

[39]

Namje Park, Kiyoung Moon, Howon Kim, Seungjoo Kim, and Dongho Won,
"XML-based Security Acceleation Methods Supporting Fast Mobile Grid (.pdf)",
Proc. of EC-Web 2005, International Conference on Electronic Commerce and Web Technologies (in conjunction with DEXA 2005), Springer-Verlag, LNCS 3590, Copenhagen, Denmark, August 22-26, 2005, pp.316-326. (SCI-E, IF:0.402)

[38]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Security Weakness in Ren et al.'s Group Key Agreement Scheme Built on Secure Two-Party Protocols (.pdf)",
Proc. of WISA 2005, International Workshop on Information Security Applications, Springer-Verlag, LNCS 3786, Jeju Island, Korea, August 22-24, 2005, pp.1-9. (SCI-E, IF:0.402)

[37]

Jin Kwak, Keunwoo Rhee, Soohyun Oh, Seungjoo Kim, and Dongho Won,
"RFID System with Fairness within the Framework of Security and Privacy (.pdf)",
Proc. of ESAS 2005, European Workshop on Security and Privacy in Ad hoc and Sensor Networks, Springer-Verlag, LNCS 3813, Visegrad, Hungary, July 13-14, 2005, pp.142-152. (SCI-E, IF:0.402)

[36]

Younggyo Lee, Injung Kim, Seungjoo Kim, and Dongho Won,
"A Method for Detecting the Exposure of OCSP Responder's Session Private Key in D-OCSP-KIS (.pdf)",
Proc. of EuroPKI 2005, European PKI Workshop: Research and Applications, Springer-Verlag, LNCS 3545, University of Kent, England, June 30 - July 1, 2005, pp.215-226. (SCI-E, IF:0.402)

[35]

Namje Park, Howon Kim, Kyoil Chung, Seungjoo Kim, and Dongho Won,
"XKMS-based Key Management for Open LBS in Web Services Environment (.pdf)",
Proc. of AWIC 2005, The 3rd Atlantic Web Intelligence Conference, Springer-Verlag, LNAI 3528, Poland, June 6-9, 2005, pp.367-373. (SCI-E, IF:0.402)

[34]

Junghyun Nam, Hyunjue Kim, Seungjoo Kim, Dongho Won, and Hyungkyu Yang,
"Practical and Provably-Secure Multicasting over High-Delay Networks (.pdf)",
Proc. of ICCS 2005, International Conference on Computational Science 2005, Springer-Verlag, LNCS 3515, Atlanta, USA, May 22-25, 2005, pp.493-501. (SCI-E, IF:0.402)

Full version : Cryptology ePrint Archive: Report 2004/115.

[33]

Namje Park, Howon Kim, Seungjoo Kim, Dongho Won,
"Open Location-based Service using Secure Middleware Infrastructure in Web Services (.pdf)",
Proc. of UWSI 2005, Ubiquitous Web Systems and Intelligence Workshop, Springer-Verlag, LNCS 3481, Singapore, May 9-12, 2005, pp.1146-1155. (SCI-E, IF:0.402)

[32]

Seokhyang Cho, Junghyun Nam, Seungjoo Kim, and Dongho Won,
"An Efficient Dynamic Group Key Agreement for Low-Power Mobile Devices (.pdf)",
Proc. of ICCSA 2005, International Conference on Computational Science and Its Applications, Springer-Verlag, LNCS 3480, Singapore, May 9-12, 2005, pp.498-507. (SCI-E, IF:0.402)

[31]

Keunwoo Rhee, Jin Kwak, Seungjoo Kim, and Dongho Won,
"Challenge-Response based RFID Authentication Protocol for Distributed Database Environment (.pdf)",
Proc. of SPC 2005, International Conference on Security in Pervasive Computing, Springer-Verlag, LNCS 3450, Boppard, Germany, April 6-8, 2005, pp.70-84. (SCI-E, IF:0.402)

[30]

Seungjoo Kim and Dongho Won
"Threshold Entrusted Undeniable Signature (.pdf)," (Slides),
Proc. of ICISC 2004, International Conference on Information Security and Cryptology, Springer-Verlag, LNCS 3506, Seoul, Korea, December 2-3 2004, pp.195-203. (SCI-E, IF:0.513)

Note : See also Bruce Schneier's "Applied Cryptography (2nd Ed.)", p.82.

[29]

Junghyun Nam, Sungduk Kim, Seungjoo Kim, and Dongho Won,
"Dynamic Group Key Exchange over High Delay Networks",
Proc. of ISPC COMM 2004, International Scientific-Practical Conference on Communication 2004, Issyk-Kul Lake, Kyrgyzstan, August 22-29, 2004, pp.262-267.

[28]

Jeeyeon Kim, Seungjoo Kim, Jin Kwak and Dongho Won,
"Cryptanalysis and Improvement of Password Authenticated Key Exchange Scheme between Clients with Different Passwords (.pdf)",
Proc. of ICCSA 2004 (Part I), International Conference on Computational Science and Its Applications - Internet Communication Security Workshop, Springer-Verlag, LNCS 3043, S. Maria degli Angeli, Assisi(PG), Italy, May 14-17, 2004, pp.895-902. (SCI-E, IF:0.513)

[27]

Junghyun Nam, Seokhyang Cho, Seungjoo Kim, and Dongho Won,
"Simple and Efficient Group Key Agreement based on Factoring (.pdf)",
Proc. of ICCSA 2004 (Part I), International Conference on Computational Science and Its Applications - Authentication Authorization Accounting (AAA) Workshop, Springer-Verlag, LNCS 3043, S. Maria degli Angeli, Assisi(PG), Italy, May 14-17, 2004, pp.645-654. (SCI-E, IF:0.513)

[26]

Ikkwon Yie, Seongan Lim, Seungjoo Kim, and Dongryeol Kim,
"Prime Numbers of Diffie-Hellman Groups for IKE-MODP (.pdf)",
Progress in Cryptology - IndoCrypt 2003, Springer-Verlag, LNCS 2904, India, 8-10 December, 2003, pp.228-234. (SCI-E)

[25]

Jeeyeon Kim, Hyunjo Kwon, Haeryong Park, Seungjoo Kim, and Dongho Won,
"An Improvement of VeriSign's Key Roaming Service Protocol (.pdf)",
Proc. of ICWE 2003, International Conference on Web Engineering, Springer-Verlag, LNCS 2722, Oviedo, Asturias, Spain, July 14-18, 2003, pp.281-288. (SCI-E)

[24]

Seungjoo Kim, Masahiro Mambo, and Yuliang Zheng,
"Rethinking chosen-ciphertext security under Kerckhoffs' assumption (.pdf)", (Slides),
Proc. of CT-RSA 2003, Cryptographers' Track RSA Conference, Springer-Verlag, LNCS 2612, San Francisco, April 13-17, 2003, pp.227-243. (SCI-E)

[23]

Jung-Yeun Lee, Jung Hee Cheon, and Seungjoo Kim,
"An analysis of proxy signatures : Is a secure channel necessary ? (.pdf)",
Proc. of CT-RSA 2003, Cryptographers' Track RSA Conference, Springer-Verlag, LNCS 2612, San Francisco, April 13-17, 2003, pp.68-79. (SCI-E)

[22]

Sung-Ming Yen, Seungjoo Kim, Seongan Lim, and Sangjae Moon,
"A countermeasure against one physical cryptanalysis may benefit another attack (.pdf),"
Proc. of ICISC 2001, International Conference on Information Security and Cryptology, Springer-Verlag, LNCS 2288, Seoul, Korea, December 6-7 2001, pp.414-427. (SCI-E, IF:0.415)

[21]

Sung-Ming Yen, Seungjoo Kim, Seongan Lim, and Sangjae Moon,
"RSA speedup with residue number system immune against hardware fault cryptanalysis (.pdf),"
Proc. of ICISC 2001, International Conference on Information Security and Cryptology, Springer-Verlag, LNCS 2288, Seoul, Korea, December 6-7 2001, pp.397-413. (SCI-E, IF:0.415)

[20]

Seongan Lim, Seungjoo Kim, Ikkwon Yie and Jaemoon Kim,
"Comments on a signature scheme based on the third order LFSR proposed at ACISP 2001 (.pdf)",
Progress in Cryptology - IndoCrypt 2001, Springer-Verlag, LNCS 2247, India, 16-20 December, 2001, pp.308-315. (SCI-E, IF:0.415)

[19]

Seungjoo Kim, Jung Hee Cheon, Marc Joye, Seongan Lim, Masahiro Mambo, Dongho Won, and Yuliang Zheng
"Strong adaptive chosen-ciphertext attack with memory dump (Or : The importance of the order of decryption and validation) (.pdf)", (Slides),
Eighth IMA Conference on Cryptography and Coding 2001, Springer-Verlag, LNCS 2260, Royal Agricultural College, Cirencester, UK, December 17-19, 2001, pp.114-127. (SCI-E, IF:0.415)

Note : See also Phong Nguyen's STORK Report, "New Trends in Cryptology", p.52.

[18]

Seongan Lim, Seungjoo Kim, Ikkwon Yie, Jaemoon Kim, and Hongsub Lee,
"XTR extended to GF(p^6m) (.pdf)",
Eighth Annual Workshop on Selected Areas in Cryptography - SAC 2001, Springer-Verlag, LNCS 2259, Toronto (Canada), August 16-17, 2001, pp.301-312. (SCI-E, IF:0.415)

[17]

Jeeyeon Kim, Seungjoo Kim, Hyunjo Kwon, Sungjae Lee, Sangjoon Park, and Dongho Won,
"Forward-secure commercial key escrow systems (.pdf)",
Proc. of WET-ICE 2001 / Enterprise Security Workshop, IEEE 10th Intl. Workshop on Enabling Technologies : Infrastructure for Collaborative Enterprises, Massachusetts Institute of Technology, Cambridge, MA, USA, June 20-22, 2001, pp.211-216.

Note : See also helpful graphics.

[16]

Seongan Lim, Seungjoo Kim, Ikkwon Yie, and Hongsub Lee,
"A Generalized Takagi-cryptosystem with a modulus of the form p^rq^s (.pdf)",
Bimal Roy, Eiji Okamoto (Eds.): Progress in Cryptology - IndoCrypt 2000, Springer-Verlag, LNCS 1977, Calcutta, India, December 10-13 2000, pp.283-294. (SCI-E, IF:0.39)

Note : See also helpful graphics.

[15]

Seungjoo Kim, Masahiro Mambo, Hiroki Shizuya and Dongho Won,
"On the security of the Okamoto-Tanaka ID-based key exchange scheme against active attacks (.ps.zip)",
Proc. of JW-ISC'2000, Japan-Korea Joint Workshop on Information Security and Cryptology, Naha, Okinawa, Japan, January 25-26 2000, pp.191-198.

Note : See also helpful graphics from Hiroki Shizuya's web.

[14]

Marc Joye, Seungjoo Kim and Narn-Yih Lee,
"Cryptanalysis of two group signature schemes (.pdf)" (See also LCIS Tech. Report TR-99-6B.),
Masahiro Mambo, Yuliang Zheng (Eds.): Proc. of ISW'99, Information Security Workshop, Springer-Verlag, LNCS 1729, Kuala Lumpur, Malaysia, November 6-7 1999, pp.271-275. (SCI-E, IF:0.872)

[13]

Seungjoo Kim, Insoo Lee, Masahiro Mambo and Sungjun Park,
"On the difficulty of key recovery systems (.pdf)", (Slides),
Masahiro Mambo, Yuliang Zheng (Eds.): Proc. of ISW'99, Information Security Workshop, Springer-Verlag, LNCS 1729, Kuala Lumpur, Malaysia, November 6-7 1999, pp.207-224. (SCI-E, IF:0.872)

[12]

Seungjoo Kim, Soohyun Oh, Sangjoon Park and Dongho Won,
"Verifiable self-certified public keys (.ps.zip and .pdf.zip)",
Daniel AUGOT and Claude CARLET (Eds.): Proc. of WCC'99, INRIA Workshop on Coding and Cryptography, Paris, France, January 11-14 1999, pp.139-148 ; Proceedings published by INRIA, France ISBN 2-7261-1136-X.

[11]

Seungjoo Kim, Soohyun Oh, Kyungkug Kim and Dongho Won,
"One-time self-certified public keys, revisited (.ps.zip and .pdf.zip)",
Proc. of ICISC'98, International Conference on Information Security and Cryptology, Vol.1/No.1, Seoul, Korea, December 18-19 1998, pp.59-69 ; ISBN 89-85305-14-X.

[10]

Soohyun Oh, Seungjoo Kim and Dongho Won,
"On the security of cryptographic techniques based on D.L.P. (.pdf)",
Proc. of KIPS'98, Korea Information Processing Society Fall Conference, Vol.5/No.2, 1998, pp.745-748.

[9]

Seungjoo Kim, Sangjoon Park and Dongho Won,
"Group signatures with observers (preliminary version) (.ps.zip)",
Proc. of CISC'97, Conference on Information Security and Cryptology, Vol.7/No.1, 1997, pp.19-25.

[8]

Seungjoo Kim, Sangjoon Park, and Dongho Won,
"Proxy signatures, revisited (.ps.zip and .pdf.zip)",
Han, Okamoto, Quing (Eds.): Proc. of ICICS'97, International Conference on Information and Communications Security, Springer-Verlag, LNCS 1334, Beijing, China, November 11-14 1997, pp.223-232. (SCI-E, IF:0.515)

Note : See also helpful graphics from Hiroki Shizuya's web.

Note : See also Manik Lal Das's Paper, "Algorithms and Approaches of Proxy Signature: A Survey", and Zhengjun Cao's paper, "Classification of Signature-only Signature Models".

[7]

Boyoung Lee, Seungjoo Kim and Dongho Won,
"ID-based multisignature scheme based on the high residuosity problem",
Proc. of JW-ISC'97, Korea-Japan Joint Workshop on Information Security and Cryptology, Seoul, Korea, October 26-28 1997, pp.227-230.

[6]

Seungjoo Kim, Sangjoon Park and Dongho Won,
"Group signatures for hierarchical multigroups (.ps.zip and .pdf.zip)",
Okamoto, Davida, Mambo (Eds.): Proc. of ISW'97, Information Security Workshop, Springer-Verlag, LNCS 1396, Tatsunokuchi, Ishikawa Japan, September 17-19 1997, pp.273-281. (SCI-E, IF:0.515)

[5]

Youngchul Choi, Seungjoo Kim, and Dongho Won,
"The problem of single term off-line coins and the countermeasures",
Zensho Nakao and Yen-Wei Chen (Eds.): Proc. of ITC-CSCC'97, International Technical Conference on Circuits/Systems, Computers and Communications, Vol.I, Okinawa, Japan, July 14-16 1997, pp.587-590.

[4]

Seungjoo Kim, Sungjun Park and Dongho Won,
"Convertible group signatures (.ps.zip and .pdf.zip)",
Kim, Matsumoto (Eds.): Advanced in Cryptology - AsiaCrypt'96, Springer-Verlag, LNCS 1163, Kyongju, Korea, November 3-7 1996, pp.311-321. (SCI-E)

Note : Sangjoon Park pointed out some weaknesses in Sungjun Park's group signature schemes of JW-ISC'95 and ICEIC'95, while the authors were preparing the camera-ready manuscript for Asiacrypt'96 conference (so, we had no time to fix it up). Because our schemes are based on previous works of Sungjun Park, our proposed schemes are also vulnerable to Sangjoon Park's attack.

[3]

Seungjoo Kim, Sungjun Park and Dongho Won,
"Zero-knowledge nominative signatures (.ps.zip)" (revised 19th November 1998),
Jiri Pribyl (Eds.): Proc. of PragoCrypt'96, International Conference on the Theory and Applications of Cryptology, Czech, Prague, September 30 - October 3, 1996, pp.380-392 ; Proceedings published by CTU(Czech Technical University) PUBLISHING HOUSE ISBN 80-01-01502-5.

[2]

Yeonyi Choi, Seungjoo Kim, Sungjun Park and Dongho Won,
"`Paradoxical' ID-based key distribution protocol for mobile communication systems",
Proc. of MDMC'96, International Workshop on Multi-Dimensional Mobile Communications, Seoul, Korea, July 18-20 1996, pp.412-415.

[1]

Seungjoo Kim, Sungjun Park and Dongho Won,
"Nominative signature",
Proc. of ICEIC'95, International Conference on Electronics, Informations and Communications, Yanji, Jilin, China, August 7-12 1995, pp.II-68 ~ II-71.

Technical Reports

[17]

Yunho Lee, Kwangwoo Lee, Seungjoo Kim, and Dongho Won,
"Efficient Voter Verifiable E-Voting Schemes with Cryptographic Receipts",
Cryptology ePrint Archive: Report 2006/167, 12 May 2006.

[16]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Security Weakness in a Three-Party Password-Based Key Exchange Protocol Using Weil Pairing",
Cryptology ePrint Archive: Report 2005/269, 14 Aug 2005.

[15]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"A weakness in Sun-Chen-Hwang's three-party key agreement protocols using passwords",
Cryptology ePrint Archive: Report 2004/348, 7 Dec 2004.

[14]

Junghyun Nam, Seungjoo Kim, Hyungkyu Yang, and Dongho Won,
"Secure Group Communications over Combined Wired/Wireless Networks",
Cryptology ePrint Archive: Report 2004/260, 10 Oct 2004.

[13]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Interleaving Attack on ID-based Conference Key Distribution Schemes",
Cryptology ePrint Archive: Report 2004/257, 5 Oct 2004.

[12]

Junghyun Nam, Seungjoo Kim, and Dongho Won,
"Attacks on Bresson-Chevassut-Essiari-Pointcheval's Group Key Agreement Scheme for Low-Power Mobile Devices",
Cryptology ePrint Archive: Report 2004/251, 24 Sep 2004.

[11]

Junghyun Nam, Jinwoo Lee, Seungjoo Kim, and Dongho Won,
"DDH-based Group Key Agreement for Mobile Computing",
Cryptology ePrint Archive: Report 2004/127, 29 May 2004.

[10]

Junghyun Nam, Sungduk Kim, Seungjoo Kim, and Dongho Won,
"Provably-Secure and Communication-Efficient Scheme for Dynamic Group Key Exchange",
Cryptology ePrint Archive: Report 2004/115, 17 May 2004.

[9]

Seungjoo Kim, Jung Hee Cheon, Marc Joye, Seongan Lim, Masahiro Mambo, Dongho Won, and Yuliang Zheng,
"Security Analysis of "Provably" Secure Cryptosystems under Strong Adaptive Chosen-Ciphertext Attack (.ps.zip)",
Technical Report of IEICE, ISSN 0913-5685, ISEC2001-89, Vol.101, No.507, pp.17-24, December 2001.

[8]

Sung-Ming Yen, Seungjoo Kim, Seongan Lim, and Sang-Jae Moon,
"RSA Speedup with Residue Number System Immune against Hardware Fault Cryptanalysis",
LCIS Tech. Report TR-2K1-5, National Central University, April 5, 2001.

[7]

Sung-Ming Yen, Ming-Shen Chang, and Seungjoo Kim,
"Improved Key Escrow with Limited Time Span",
LCIS Tech. Report TR-2K-6, National Central University, March 31, 2000.

[6]

Seungjoo Kim, Sungjun Park, Sung-Ming Yen and Dongho Won,
"Comments on two key escrow schemes of ACISP'99 and PKC'99 (.ps),"
Manuscript, 1999.

[5]

Seungjoo Kim,
"On Tseng-Jan self-certified public-keys based group signature (.ps)" (See also M.Joye's LCIS Tech. Report TR-99-6B.),
Personal communication with Marc Joye, May. 1999.

[4]

Soohyun Oh, Seungjoo Kim and Dongho Won,
"On the security of cryptographic techniques based on D.L.P (.pdf)",
The Dept. of Information Eng., Sungkyunkwan Univ., Technical Report, SKKU/TR-98-2, Aug. 1998.

[3]

Seungjoo Kim, Soohyun Oh, Sangjoon Park and Dongho Won,
"On Saeednia's key-exchange protocols (.ps)",
The Dept. of Information Eng., Sungkyunkwan Univ., Technical Report, SKKU/TR-98-1, May. 1998.

[2]

Seungjoo Kim, Sangjoon Park and Dongho Won,
"Equivocally verifiable encryption and its applications (.ps)",
The Dept. of Information Eng., Sungkyunkwan Univ., Technical Report, SKKU/TR-97-1, Jan. 1997.

[1]

Seungjoo Kim, Sungjun Park and Dongho Won,
"Linkable blind signatures",
Abstract presented at AsiaCrypt'96 (rump session)", November 3-7 1996.

Dissertations

[2]

Seungjoo Kim,
"Improved privacy and authenticity in digital signatures / key management" (Certified by : Dongho Won (Prof. of Information Eng., Thesis Supervisor), Jinwook Chung (Prof. of Information Eng.), Daejoon Hwang (Prof. of Information Eng.), Jongin Lim (Prof. of Math., Korea Univ.), Sungjun Park (Director of KISA)),
Ph.D. Thesis, Information & Communications Security Lab., Dept. of Information Eng., Sungkyunkwan University, Korea, February 1999.

Slides (in Korean) : 2nd PhD defense (.ps) / Final PhD defense (.ps)

[1]

Seungjoo Kim,
"Zero-knowledge nominative signatures" (Supervisor : Dongho Won (Prof. of Information Eng.)),
Ms.D. Thesis, Information & Communications Security Lab., Dept. of Information Eng., Sungkyunkwan University, Korea, February 1996.

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