What is the relevance of "physical layer security" to cryptography?
Driven by the saying "secure by design", scientist start thinking about how they gonna secure the network while they are designing it. Cryptography is happening in the network layer. Scientists wishing that, by adding some security features in the physical layer, this will improve the security of the information in the upper layer and overall. In the future, millions of devices will be connected together and crossing each other… securing them by cryptography alone is a scary idea.