Doctor of Philosophy, Kyungpook National University, Korea, 2002. Bachelor of Science in Computer Engineering, Kyungil University, Republic of Korea, 1996.
Chief researcher Ditto Technology, Daegu, 2000—2002. Assistant professor Kyungil University, Kyungsan, Kyungpuk, since 2002. Editor Korea Institute Information Security & Cryptology, Seoul, South Korea, since 2002.
Sergeant 9th Special Airforces, 1993-1995, Kyungki, Korea.
Member of Korea Information Science Society.
Married Hye-Jin Chang, November 23, 2003.