Security is an indispensable requirement for most network applications, though security is regarded as a standalone component of the architectures of many systems, in case of wireless networks. It must get adequate attention. The types of services expected in wireless networks often require the network security architecture. However, for ensuring a good level of security for such types of networks is not a trivial task. In case of wireless communications, the threats and attacks against wireless networks them are more diverse and often large-scale, and it‘s not possible to deal with all types of security threats with a single mechanism. Rather, a combination of different security schemes for a single network could be the solution. For example, an attack at the physical layer such as jamming cannot be handled by any key management scheme. Hence, several mechanisms at different layers can be employed simultaneously, to provide holistic security for wireless networks and in addition the level of security in the data transmission and communication phase can be increased via efficient key management schemes.