Abstract: Mobile Ad hoc Networks (MANETs) have many potential applications in various fields such as military services, collaborative and distributed computing, emergency operations, wireless sensor networks and hybrid wireless networks. Dynamic Service Discovery and Advertisement (SDA) have also brought significant issues to the networking technologies. Since most protocols in mobile ad-hoc network do not have built-in security and all mobile devices communicate with each other through a wireless link without any intermediate infrastructure, security issues must be addressed. Accordingly, all devices should be able to advertise their own services and discover their required services dynamically and safely. Obviously, achieving security goals such as entity authentication, data confidentiality, data integrity, non-repudiation are critical because of the many opportunities for misuse. A Cluster-Based Distributed Certificate Authority (CB-DCA) which is a fully distributed certificate authority protocol is proposed to support the proposed Secure Hierarchical Service Discovery and Advertisement Protocol (SHSDAP). Compared to the APBC and EZRP protocols, it is obvious that SA & SD overhead, routing overhead and energy consumption are significantly lower than for other protocols. Furthermore, in all cases, the SD hit ratio of our proposed protocol is higher than 86%. SHSDAP is secure against attacks and forged identities.

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