우리는 미국의 범지구위성항법시스템인 GPS로부터 위치 및 시간 정보를 수신하여 네비게이션 등에서 사용하고 있으나 수십미터 오차를 가진다. 항공이나 자율주행 등 정밀한 위치 정보가 필요한 경우에는 오차를 보정하기 위한 정밀보정 서비스가 필요하기 때문에 해외에서도 정밀도를 높이기 위한 서비스를 준비하고 있다. 반면, 위성항법메시지에 대한 스푸핑 공격은 항공, 선박 등의 위치를 교란시킴으로써 사회·경제적 혼란과 피해를 야기시킬 수 있다. 점차 다양해지고 정밀해진 GNSS에 대한 공격은 정밀보정 서비스에서 더욱 치명적일 수 있기 때문에 위성메시지 인증에 대한 연구가 필요하다. 인증 방식은 각 GNSS 전송속도나 메시지 구조 등 그 특성에 따라 달라질 수밖에 없기 때문에 각국의 GNSS에 대한 인증연구가 이루어지고 있다. 본 논문에서는 우리나라에서 추진하고 있는 KPS에 적용될 수 있는 민간용 위성항법 데이터와 정밀보정 메시지에 대한 인증 방안을 제시한다.
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