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Mobile ad hoc networking is an operating mode for rapid mobile host interconnection, where nodes rely on each other, in order to maintain network connectivity and functionality. Security is one of the main issues for mobile ad hoc networks (MANETs) deployment. We introduce a weak to strong authentication mechanism associated with a multiparty contributory key agreement method, designed for dynamic changing topologies, where nodes arrive and depart from a MANET at will. We introduce a new cube algorithm based on the body-centered cubic (BCC) structure. The proposed system employs elliptic curve cryptography, which is more efficient for thin clients where processing power and energy are significant constraints. The algorithm is designed for MANETs with dynamic changing topologies due to continuous flow of incoming and departing nodes.