  In this paper, we study the secrecy rate and outage probability in
Multiple-Input-Single-Output (MISO) Gaussian wiretap channels at the limit of a
large number of legitimate users and eavesdroppers. In particular, we analyze
the asymptotic achievable secrecy rates and outage, when only statistical
knowledge on the wiretap channels is available to the transmitter.
  The analysis provides exact expressions for the reduction in the secrecy rate
as the number of eavesdroppers grows, compared to the boost in the secrecy rate
as the number of legitimate users grows.
