-Building, operating, and managing the IT security infrastructure for the Large internet portal
-IT Infrastructure vulnerability analysis, evaluation, and derive improvements. (Quantify the security audit score to reflect the rating of each infrastructure workforce)
-Audit IT businesses and derive improvements (First time in NHN to conduct security audit to the workplace)
Admin at Hacker4U 2000-2002
NHN IT Security System established 2005-2007
KOEA first security conference Founder 2006
NHN CHINA Security System established 2007-2010
HARU&SECUINSIDE Founder 2011
SECUINSIDE organized 2011,2012,2013,2014,2015,2016
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