  First, we show a new inexpensive defense against intruders and the
man-in-the-middle attack in the Kirchhoff's-loop-Johnson-like-noise (KLJN)
cipher. Then instead of point-to-point communication, we propose a high
efficiency, secure network. The (in the idealistic case totally secure)
classical network is based on an improved version of the KLJN cipher. The
network consists of two parallel networks: i) a chain-like network of securely
communicating, electrically isolated Kirchhoff-loops with Johnson-like noise
and driven by a specific switching process of the resistances; ii) and a
regular non-secure data network with a Coordinator-server. If the classical
network is fast enough, the chain-like network of N communicators can generate
and share an N bit long secret key within a single clock period of the ciphers
and that implies a significant speed-up compared to the point-to-point key
exchanges used by quantum communication or RSA-like key exchange methods. This
is a teleportation-type multiple telecloning of the classical information bit
because the information transfer can take place without the actual presence of
the information bit at the intermediate points of the network. With similar
quantum schemes the telecloning of classical bits via quantum communicator
networks without telecloning the quantum states is also possible.
