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While existing security protocols were designed with a focus on the corenetwork, the enhancement of the security of the B5G access network becomes ofcritical importance. Despite the strengthening of 5G security protocols withrespect to LTE, there are still open issues that have not been fully addressed.This work is articulated around the premise that rethinking the security designbottom up, starting at the physical layer, is not only viable in 6G butimportantly, arises as an efficient way to overcome security hurdles in noveluse cases, notably massive machine type communications (mMTC), ultra reliablelow latency communications (URLLC) and autonomous cyberphysical systems. Unlikeexisting review papers that treat physical layer security orthogonally tocryptography, we will try to provide a few insights of underlying connections.Discussing many practical issues, we will present a comprehensive review of thestate-of-the-art in i) secret key generation from shared randomness, ii) thewiretap channel and fundamental limits, iii) authentication of devices usingphysical unclonable functions (PUFs), localization and multi-factorauthentication, and, iv) jamming attacks at the physical layer. We finallyconclude with the proposers' aspirations for the 6G security landscape, in thehyper-connectivity and semantic communications era.

What Physical Layer Security Can Do for 6G Security