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모바일 애드 혹 네트워크 상에서 가중치를 둔 비밀 공유를 이용한 분산 인증 기관 구축 방법

모바일 애드 혹 네트워크 상에서 가중치를 둔 비밀 공유를 이용한 분산 인증 기관 구축 방법
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Node authentication is an essential security service in mobile ad-hoc networks (MANETs). To provide a node authentication service, we have to construct a distributed certificate authority in MANETs. Many distributed certificate authority schemes were proposed, but Fully Distributed Certificate Authority (FDCA) schemes are suitable for MANETs because they don’t need any unrealistic assumptions and they can provide certificate services based on one-hop neighbor nodes. However, FDCA schemes cannot provide certificate service when there are not enough neighbors. In this thesis, to solve the number of neighbor node problem in FDCA schemes, we propose a distributed certificate authority scheme with weighted secret sharing. Proposed scheme can enhance the certificate service stability by adjusting each CA node’s secret share weight with considering current node degree information. To adjust the share weight, we also proposed a bivariate polynomial-based weighted threshold signature scheme. We have analyzed our scheme based on security criteria, and have conducted extensive experiments using the ns-2 simulator to evaluate our scheme and compare it with previous schemes.
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