This paper presents a method of increasing the secrecy
capacity utilizing the channel diversity technique in wireless
communication. In general, a relatively higher secrecy capacity
can be achieved at the intended receiver by deploying channel
diversity to mitigate the effect of low signal to noise ratio. In this
analysis, the legitimate receiver and the eavesdropper are
assumed to employ maximal ratio combining diversity technique
to combine the received signals coming from the transmitter.
Considering Nakagami-m wireless fading channels, closed-form
expressions for the secrecy outage probability and the probability
of secrecy capacity are derived, which can be used as quality of
service metrics. The numerical result confirms that the security
of any wireless network model or communication system at a
common operating system can be improved by using maximal
ratio combining diversity technique as expected.