| Public Agencies |
| Ministry of Government Administration & Home Affairs |
| Ministry of Information & Communication |
| Ministry of Justice |
| Seoul Metropolitan Government |
| Korea Customs Service |
| National Tax Service |
| 16 Major Provinces and Cities Government |
| 4 Major Social Insurances |
| Health Insurance Review Agency |
| Institute of Information Technology Assessment |
| Electronics and Telecommunications Research Institute |
| KTNET |
| Korea Highway Corporation |
| Coal Industry Promotion Board |
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| Financial Group |
| Korea Financial Telecommunications & Clearings Institute |
| Korea Securities Computer Corp |
| Ministry of Commerce & Industry |
| Bank of Woori |
| Bank of Pusan |
| Standard Chartered First Bank Korea |
| Samsung Card |
| LG Investment & Securities |
| Metlife Korea |
| Mirae Asset Securities |
| Samsung Fire & Marin Insurance |
| Kookmin Bank Card |
| Lotte Card |
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| Corporations |
| Korea Information Certificate Authority |
| Korea Electronic Certification Authority |
| Yonhap News |
| Samsung Electronics |
| Samsung SDS |
| LG Electronics |
| LG Siltron |
| LG CNS |
| POS DATA |
| Hyundai Petrochemica |
| Hyundai Information technology |
| Ssangyong Information & Communications |
| Tonyang Systems |
| KCC Information & Communication |
| Fujitsu Korea |
| Shinwon Information Technology |
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| Telecommunications and others |
| SK Telecom |
| KTF |
| LG Telecom |
| DACOM |
| Soonchunhyang Univ |
| Dongyang Technical College |
| FEELink |
| Daou Tech |
| Moorim Electronics &Communication |
| InfoBANK |
| Doori Internet |
| Amway |
| ITPlus |
| Hanul Information |
| Donga Seetech |
| SysOne |
| PimsTech |
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