Abstract: This paper provides an in-depth analysis of opportunistic networks (OppNets), focusing specifically on the aspects of security and quality of service (QoS). OppNets are characterized by their dynamic and ad hoc nature, presenting unique challenges and opportunities for communication. The paper examines the fundamental concepts underlying opportunistic networks and highlights the potential benefits they offer in various domains such as disaster management, vehicular networks, and rural communication. Moreover, the review identifies the key research challenges associated with security and QoS in opportunistic networks, including trust establishment, data privacy, routing protocols, and resource management. The paper also explores existing approaches and solutions proposed in the literature to address these challenges. By shedding light on the research gaps and future directions, this review aims to inspire further advancements in security and QoS aspects of opportunistic networks, ultimately contributing to their practical deployment in real-world scenarios.

OppNet, Ad-hoc Network, Routing, Security, QoS, Machine Learning