Secret　key　generation　(SKG)　is　an　emerging　technology　to　secure　wireless　communication　from　attackers.　Therefore,　the　SKG　at　the　physical　layer　is　an　alternate　solution　over　traditional　cryptographic　methods　due　to　wireless　channels＇　uncertainty.　However,　the　physical　layer　secret　key　genera-tion　(PHY-SKG)　depends　on　two　fundamental　parameters,　i.e.,　coherence　time　and　power　allocation.　The　coherence　time　for　PHY-SKG　is　not　applicable　to　secure　wireless　channels.　This　is　because　coherence　time　is　for　a　certain　period　of　time.　Thus,　legitimate　users　generate　the　secret　keys　(SKs)　with　a　shorter　key　length　in　size.　Hence,　an　attacker　can　quickly　get　information　about　the　SKs.　Consequently,　the　attacker　can　easily　get　valuable　information　from　authentic　users.　Therefore,　we　considered　the　scheme　of　power　allocation　to　enhance　the　secret　key　generation　rate　(SKGR)　between　legitimate　users.　Hence,　we　pro-pose　an　alternative　method,　i.e.,　a　power　allocation,　to　improve　the　SKGR.　Our　results　show　72%　higher　SKGR　in　bits/sec　by　increasing　power　transmission.　In　addition,　the　power　transmission　is　based　on　two　important　parameters,　i.e.,　epsilon　and　power　loss　factor,　as　given　in　power　transmission　equations.　We　found　out　that　a　higher　value　of　epsilon　impacts　power　transmission　and　subsequently　impacts　the　SKGR.　The　SKGR　is　approximately　40.7%　greater　at　250　from　50　mW　at　epsilon　=　1.　The　value　of　SKGR　is　reduced　to　18.5%　at　250　mW　when　epsilonis　0.5.　Furthermore,　the　transmission　power　is　also　measured　against　the　different　power　loss　factor　values,　i.e.,　3.5,　3,　and　2.5,　respectively,　at　epsilon　=　0.5.　Hence,　it　is　concluded　that　the　value　of　epsilon　and　power　loss　factor　impacts　power　transmission　and,　consequently,　impacts　the　SKGR.