참고문헌
- Cryptofraphy and Network Security;Principles and Practice Second Edition William Stallings
- Digital Cerificates/Applied Internet Security Jalal Feghhi;Pete Williams
- SSL 3.0 SPECIFICATION
- IP Security Protocol (ipsec) IETF
- Building Internet Firewalls D. Brent Chapman;Elizabeth Zwicky
- 전자상거래 통계조사 결과 통계청