Demand of a safe communication is increasing rapidly with the progress of IP communications and systems such as distributed storage systems. With this background, it is now important to realize a "perfect classification" for the safe exchange of data, which disables the monitoring of; not only the contents of information, but also the control information like its address. To realize this, this report proposes a method of private key exchange. This method is based on the principle of commutative law and uses a double locking technique without introducing any public key. This method requires only a small hardware addition and even makes it difficult to probe a line or to monitor the CRT image through the electromagnetic noise generated from its cable.
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