2013/08/30 by Alejandro Cohen, Asaf Cohen, Cohen, Alejandro +1
Computer Science · Engineering · #Cooperative Communication and Network Coding #Energy Harvesting in Wireless Networks #FOS: Computer and information sciences #Information Theory (cs.IT) #Wireless Communication Security Techniques
paper · pdf · doi:10.48550/arxiv.1308.6736
openalex publication_date 2013/08/30 · openalex created_date 2022/08/09 · openalex updated_date 2026/07/28
In this paper, we consider the secrecy capacity of a wiretap channel in the\npresence of causal state information and secure rate-limited feedback. In this\nscenario, the causal state information from the channel is available to both\nthe legitimate transmitter and legitimate receiver. In addition, the legitimate\nreceiver can send secure feedback to the transmitter at a limited rate Rf . We\nshown that the secrecy capacity is bounded. Moreover, when the channel to the\nlegitimate receiver is less noisy than the channel to the eavesdropper, the\nbound is shown to be tight. The capacity achieving scheme is based on both the\nWyner wiretap coding and two steps of shared-key generation: one from the state\ninformation and one via the noiseless feedback. Finally, we consider several\nspecial cases. When state information is available only at the legitimate\nreceiver, the analysis suggests that unlike previous results involving\nfeedback, it is better to use the feedback to send the state information to the\ntransmitter (when possible), rather than send a random key.\n