Presently, the speedy advances in
processor, memory, and radio technology have enabled the development of
distributed networks of small, inexpensive nodes that are capable of sensing,
computing, and wireless communication. Wireless sensor networks (WSNs) are
collections of a large quantity of small devices equipped with incorporated
sensing and wireless communication abilties. They’re taken into consideration
as a completely unique case of ad hoc networks with decreased or no mobility.
Sensor networks share a few important characteristics with ad hoc networks, for
instance they share the need for self-organization, wireless multi-hop
operation, and time-variability in topology. The flexibility within the
wireless sensor network communication is induced through the cross layering
concept which decreases the quantity of modularity via inter layer parameters
exchange which improves the performance, reliability and adaptability within
the approach of wireless network communication. The inter layer data exchange
is employed to enable the choice of nodes that are capable of efficient
communication. However, the cross layering concept suffers from security
attacks on the nodes used for data forwarding. As wireless sensor networks
become more popular and extensively used, security will become a very serious
problem. Users do not want to expose their data to unauthorized people as the
disclosed data could be used for malicious purposes. This issue is even more
relevant to wireless environments where anyone can overhear a message sent over
the radio. It is vulnerable to insider and outsider attacks due to
collaborative and dynamic nature. In this paper, we propose a trust based cross
layering framework to provide defense against security attacks employing a
fuzzy logic based trust estimation mechanism, that is tailored to formulate the
empirical interpretation of inaccurate chances for calculating the reputation
in the nodes to ensure secure forwarding and reliable delivery of data. The
design principle is complete unified cross-layering such that both the
information and the functionalities of conventional communication layers are
melted in a single protocol.  we further
proposed the trust based fuzzy implicit cross layer protocol, a trust based
cross layer framework designed protocol, that uses multiple parameters that are
extracted through the inter layer information exchange so as to mitigate the
effects of security threats in an exceedingly wireless sensor network. The
proposed trust based fuzzy implicit cross layer protocol is compared with the
present protocols, that also achieved minimal security by altering their
routing semantics. The conducted experiments evaluated the security performance
of the protocols and also the results show that the proposed protocol
considerably outperforms the present protocols in terms of packet delivery.