| Summary: | In this paper, the Gaussian wiretap feedback channel is revisited, and some new results<br />on its secrecy capacity are obtained. To be specific, first, we show that the Schalkwijk−Kailath (SK)<br />feedback scheme, which achieves the secrecy capacity of the degraded Gaussian wiretap feedback<br />channel, also achieves the secrecy capacity of the non-degraded Gaussian wiretap feedback channel.<br />Second, applying the existing secret key-based feedback schemes to Gaussian wiretap feedback<br />channels, we derive some new lower bounds on the secrecy capacities of these models. Finally,<br />we compare the performances of the above feedback schemes in the degraded and non-degraded<br />Gaussian wiretap feedback channels and show which feedback scheme performs better for these<br />channel models.
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