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An ad hoc network is defined as the collection of computers (nodes) that work together by forwarding packets for each other over a multi-hop wireless network. Users connect through an ad hoc network with the aim of using demanding applications such as videoconferencing, Voice over IP, and streaming media. Due to factors such as power, cost and government regulation, over provisioning (a common technique in wired networks) cannot be used with wireless networks. This makes Quality of Service (QoS) routing important in wireless networks. Although many QoS-routing protocols have been proposed for use in ad hoc networks buy their security is still to be established. This paper presents SQoS, a secure form of QoS-Guided Route Discovery for on-demand ad hoc network routing. This protocol depends completely on symmetric cryptography, which are almost three to four orders of faster magnitude (in computation time) than asymmetric cryptography. The paper writes about the shortcomings of existing QoS-Guided Route Discovery that is capable of only transmitting a number of packets exponential in the number of network nodes for a single route discovery. This makes it vulnerable to Denial-of-Service (DoS) attacks. This is taken care of by SQoS, which provides the source with control over which route requests are forwarded and in the process limits this overhead to be linear in the number of network nodes.
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