Mechanism to verify physical proximity

摘要

Two participants may observe periodic data sources available only in the vicinity of physical trust (i.e. a wifi beacon). If an initial test of whether each participant has received the same key is passed, each party may hash the periodic source and communicate it to the other over a non-proximal communication channel (an IP network) and both are able to verify that the other (or agent of the other) is within the same vicinity.