  An absolutely secure, fast, inexpensive, robust, maintenance-free and
low-power- consumption communication is proposed. The states of the information
bit are represented by two resistance values. The sender and the receiver have
such resistors available and they randomly select and connect one of them to
the channel at the beginning of each clock period. The thermal noise voltage
and current can be observed but Kirchoff's law provides only a second-order
equation. A secure bit is communicated when the actual resistance values at the
sender's side and the receiver's side differ. Then the second order equation
yields the two resistance values but the eavesdropper is unable to determine
the actual locations of the resistors and to find out the state of the sender's
bit. The receiver knows that the sender has the inverse of his bit, similarly
to quantum entanglement. The eavesdropper can decode the message if, for each
bits, she inject current in the wire and measures the voltage change and the
current changes in the two directions. However, in this way she gets discovered
by the very first bit she decodes. Instead of thermal noise, proper external
noise generators should be used when the communication is not aimed to be
stealth.
