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Shannon introduced the classic model of a cryptosystem in 1949, where Eve hasaccess to an identical copy of the cyphertext that Alice sends to Bob. Shannondefined perfect secrecy to be the case when the mutual information between theplaintext and the cyphertext is zero. Perfect secrecy is motivated byerror-free transmission and requires that Bob and Alice share a secret key.Wyner in 1975 and later I.~Csisz\'ar and J.~K\"orner in 1978 modified theShannon model assuming that the channels are noisy and proved that secrecy canbe achieved without sharing a secret key. This model is called wiretap channelmodel and secrecy capacity is known when Eve's channel is noisier than Bob'schannel.  In this paper we review the concept of wiretap coding from the satellitechannel viewpoint. We also review subsequently introduced stronger secrecylevels which can be numerically quantified and are keyless unconditionallysecure under certain assumptions. We introduce the general construction ofwiretap coding and analyse its applicability for a typical satellite channel.From our analysis we discuss the potential of keyless information theoreticphysical layer security for satellite channels based on wiretap coding. We alsoidentify system design implications for enabling simultaneous operation withadditional information theoretic security protocols.

Information-theoretic Physical Layer Security for Satellite Channels