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’73 Mar. ~ ’80 Feb. : B.E of Electronic Engineering inYonsei University, Korea.
’81.Sep. ~ ’83 Aug. : M.E of Electronic Engineering in Yonsei University, Korea
– Thesis : “A Study on the Microwave Digital Radio System by Computer Simulation”

’88.Feb. ~ ’91 Mar. : Ph.D of Div. of Electrical & Computer Engineering in Yokohama National University, Japan.
– Dissertation : “A Study on the Construction and Analysis of Substitution-Boxes for Symmetric Cryptosystems”, Postscript file and its zip file.

’79 Dec. ~ ’97 Dec. : Section Head of Coding Tech. #1 in ETRI (Electronics and Telecommunications Research Institute)
’95 Jan. ~ ’97 May : Chairman of JSC27 in TTA (Telecommunications Technology Association)
’96 Mar. ~ ’97 Aug. : Adjunct Professor at Computer Science Dept. in ChungNam National University
’99 Dec. ~ ’00 Feb. : Visiting Professor at Yokohama National University and University of Tokyo, Japan
’00 Jan. ~ ’04 Dec. : Director of IACR
’03 Jan. ~ ’05 Jan. : Director of Institute for IT-gifted Youth

’98 Jan. ~ ’16 Aug. : Professor at School of Engineering in ICU
’01 Mar. ~ ’06.Dec : Director of IRIS
’05 Jan. ~ ’08 Dec. : Asiacrypt Steering Committee Chair
’05 Feb. ~ ’05 May : Visiting Scientist to Prof. Rivest@CSAIL/MIT
’05 Jun. ~ ’05 Nov. : Visiting Professor to Prof. Bellare@UCSD
’08 Jan. ~ ’08 Dec. : Executive Vice President of KIISC
’06 Aug. ~ ’09 Feb. : Dean of School of Engineering in ICU
’09 Jan. ~ ’09 Dec. : President of KIISC
’12.Jan. ~ ’12 Aug. : Visiting Professor at Security Program in KUSTAR, UAE
’13 Jan. ~ ’13 Feb. : Education Specialist to ITB, Indonesia
’13 Jun. ~ ’13 Jul. : Education Specialist to ITB, Indonesia

’12.Jan.~’19.Dec.: J. of Mathematical Cryptology,  Associate Editor

’09 Mar. ~ ’21 Aug : Professor in School of Computing, KAIST

’14 Apr. ~ ’19.Dec : Korean Representative of IFIP TC-11
’16.Jun.~ ’20. Dec : Cryptography, MDPI, Editor-in-Chief

’17. Dec. ~ ’21. Mar: IACR Fellows Selection Committee

’10.Jan. ~ Present : Honorable Present of KIISC

’16.Jun.~ Present: Expert Committee member of IEICE ISEC group

’17 Mar. ~ Present : Fellow of the IACR

’21. Sep. ~ Present: KAIST Emeritus Professor

’21. Sep. ~ Present: President of International Research for Cyber Security (IRCS)