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Recently, there has been growing interest in secure communication via multi-antenna physical-layer designs. In this paper, the authors consider a transmit covariance design for a secrecy rate maximization problem under a multicast scenario, where a multi-antenna transmitter delivers a common confidential message to multiple single-antenna receivers in the presence of multiple multi-antenna eavesdroppers. This multicast Secrecy Rate Maximization (SRM) problem is non-convex by nature. By resorting to a convex approximation, they provide an upper bound and lower bounds of the multicast secrecy rate by solving a semi-definite program.
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