Rafael F. Schaefer

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The wiretap channel models secure communication of two users in the presence of a non-legitimate eavesdropper who must be kept ignorant of transmitted messages. The performance of such a system is usually characterized by its secrecy capacity determining the maximum transmission rate of secure communication. In this paper, the issue of whether the secrecy(More)
—This paper considers a three-receiver broadcast channel with degraded message sets and message cognition. The model consists of a common message for all three receivers, a private common message for only two receivers and two additional private messages for these two receivers, such that each receiver is only interested in one message, while being fully(More)