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The imperative need for unconditional secure key exchange is expounded by theincreasing connectivity of networks and by the increasing number and level ofsophistication of cyberattacks. Two concepts that are information theoreticallysecure are quantum key distribution (QKD) and Kirchoff-law-Johnson-noise(KLJN). However, these concepts require a dedicated connection between hosts inpeer-to-peer (P2P) networks which can be impractical and or cost prohibitive. Apractical and cost effective method is to have each host share their respectivecable(s) with other hosts such that two remote hosts can realize a secure keyexchange without the need of an additional cable or key exchanger. In thisarticle we analyze the cost complexities of cable, key exchangers, and timerequired in the star network. We mentioned the reliability of the star networkand compare it with other network geometries. We also conceived a protocol andequation for the number of secure bit exchange periods needed in a starnetwork. We then outline other network geometries and trade-off possibilitiesthat seem interesting to explore.

Resource requirements and speed versus geometry of unconditionally secure physical key exchanges