Barbosa et al. Reply to ``Comment on 'Secure Communication using   mesoscopic coherent states', Barbosa et al, Phys Rev Lett 90, 227901", Yuan   and Shields, Phys. Rev. Lett. 94, 048901(2005)
  Yuan and Shields claim that our data-encryption protocol is entirely equivalent to a classical stream cipher utilizing no quantum phenomena. Their claim is, indeed, false. Yuan and Shields also claim that schemes similar to the one presented in Phys. Rev. Lett. 90, 227901 are not suitable for key generation. This claim is also refuted. In any event, we welcome the opportunity to clarify the situation for a wider audience. 
Horace Yuen, Eric Corndorf, Geraldo Barbosa, and Prem Kumar