This　letter　tackles　whether　and　how　repetition　coding　enables　reliable　and　covert　communications　by　considering　binary　phase　shift　keying.　Communication　reliability　and　covertness　are　analyzed　in　terms　of　the　bit　error　rate　P　e　and　the　minimum　detection　error　probability　xi　*.　Our　examination　shows　that,　when　a　warden　Willie　knows　the　codeword　structure,　both　P　e　and　ξ　*　are　determined　by　the　total　power　nP　and　do　not　depend　on　the　codeword　length　n　or　the　transmit　power　P　individually.　However,　this　conclusion　does　not　hold　for　the　unknown　codeword　structure,　where　increasing　n　can　significantly　improve　the　communication　reliability　under　the　same　covertness　constraint,　and　vice　versa.　©　2012　IEEE.