  This paper deals with the Kirchhoff-law-Johnson-noise (KLJN) classical
statistical physical key exchange method and surveys criticism - often stemming
from a lack of understanding of its underlying premises or from other errors -
and our related responses against these, often unphysical, claims. Some of the
attacks are valid, however, an extended KLJN system remains protected against
all of them, implying that its unconditional security is not impacted.
