Improving Physical Layer Security in Wireless Communication using Hybrid Techniques.

As per the conception of RF (Radio) propagation, wireless communications can be easily overheard by unauthorized users for interception and thus wireless communication are highly vulnerable to eaves dropping attacks by exploitation of physical characteristics of wireless channels. The propose work is focused on development of diversity techniques to enhance physical layer security, marking a paradigm Shift from conventional artificial noise generation and beam forming techniques. Artificial noise techniques are highly power hungry and require on additional degree of power capacity which is not suitable for better operated system. Thus work is focused at development of a new techniques using variable length cryptography in which MAC (Medium Access Control)/ address of the wireless nodes for key generation purposes. Also, it is proposed, that the keys for communication encryption are randomized by a global time source such as GPS or internal master RTC (Real Time Clock). This unique feature allows a high degree of security as keys are truly random due to Millisecond level synchronization key randomization using a global accurate time source facility highly secure communication in a closed group. Also, the author has proposed key expiry time, after elapse station of such time, all key will have to be farce fully regenerated. [ABSTRACT FROM AUTHOR]