You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Security challenges in mobile ad hoc networks:a survey 
Chapter Title:  INCORPORATING SECURITY AND OTHER CHALLENGES 
1. Abstract of Cited Paper (BIB001):  We propose and present a framework for enabling policy-based routing in mobile ad hoc networks (MANETs) by applying policy rules associated with the security and reliability (of connection) to peer-to-peer security associations (SA) that are established on (multi-link) routes. In this proposal, we leverage and integrate the concept of dispersity routing with the management and maintenance of an existing modular security architecture. We adopt the Ad hoc On-demand Multipath Distance Vector (AOMDV) routing protocol to achieve dispersity routing. We further expand the modular security architecture, containing the Trust-enhanced Routing Table (TRT) module to include a reliability metric so that a route, among multiple available routes to a destination, may be selected and tracked with policy-set parameters. Under our proposal, a secure route is one that would be mapped through authenticated (trusted) nodes with established SAs, whereas a reliable route is one that would have a high Mean Time Between Failures (MTBF). The combination of trust and reliability as parameters used with multiple routes renders a graded routing service — the capability of providing several potential routes to a destination in a MANET, each of which may be selected because its security and reliability metrics match those of the policy. We support this proposal with a proof of concept simulation and we discuss that secure and reliable policy-based routing in MANETs is a worthwhile area for further research and investment.

Literature Review:
One way to provide security in MANET, besides decreasing network overhead, is to incorporate security approaches with other challenges. In this way, both challenges are solved by improving security parameters in total. We discuss these combinational approaches as follows: Secure routing protocols: The aim of these approaches is to provide security in routing phase. When a node wants to create a path to a destination, it uses some mechanisms to find a secure path and detect malicious nodes in the selected path before sending packets or after sending a number of packets. Authors in BIB001 presented a secure routing protocol based on using IPSEC in MANET routing protocols. Authors in BIB002 presented a trust based security routing protocol to create secure path. In MANET, there is more than one path between two different nodes. Selecting best path based on both routing and security, will improve security parameters.