This work proposes a new distributed and self-organized authentication scheme for Mobile Ad-hoc NETworks (MANETs). Apart from describing all its components, special emphasis is placed on proving that the proposal fulfils most requirements derived from the special characteristics of MANETs, including limited physical protection of broadcast medium, frequent route changes caused by mobility, and lack of structured hierarchy. Interesting conclusions are obtained from an analysis of simulation experiments in different scenarios.
Later, @cite_17 developed a group access control framework based on a menu of cryptographic techniques, which included simple access control policies, such as static ACLs (Access Control Lists), as well as admission based on the decision of a fixed entity: external (e.g., a CA or a Trusted Third Party) or internal (e.g., a group founder). The main drawback of such a proposal is that those policies are inflexible and unsuitable for dynamic ad-hoc networks. For instance, static ACLs enumerate all possible members and hence cannot support truly dynamic membership, and admission decisions made by a Trusted Third Party (TTP) or a group founder violate the peer nature of the underlying ad-hoc group.
@cite_17
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Security in collaborative peer groups is an active research topic. Most previous work focused on key management without addressing an important pre-requisite: admission control, i.e., how to securely admit a new member. This paper represents an initial attempt to sketch out an admission control framework suitable for different flavors of peer groups and match them with appropriate cryptographic techniques and protocols. Open problems and directions for future work are identified and discussed.