WPP 지불 프로토콜은 WAP 프로토콜을 이용하여 무선인터넷에서 신용카드 지불을 수행한다. 그러나 WPP 지불 프로토콜은 WAP의 보안 프로토콜인 WTLS를 사용함으로써 종단간 보안을 제공하지 못하는 문제점을 가지고 있다. 본 논문에서는 공개키 암호 시스템과 Mobile Gateway를 사용하여 특정 무선인터넷 플랫폼과 독립적인, 종단간 보안이 제공되는 지불 프로토콜을 제안한다. 제안한 지불 프로토콜은 온라인 인증기관이 지불 프로토콜의 인증과정에 참여함으로써, 이동성이 많은 무선단말기가 다른 도메인에 존재하는 서비스 제공자에게도 서비스를 받을 수 있다.
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