One-time-pad (OTP) encryption simply cannot be cracked, even by a quantumcomputer. The need of sharing in a secure way supplies of symmetric random keysturned the method almost obsolete as a standing-alone method for fast and largevolume telecommunication. Basically, this secure sharing of keys and theirrenewal, once exhausted, had to be done through couriers, in a slow and costlyprocess. This paper presents a solution for this problem providing a fast andunlimited renewal of secure keys: An untappable key distribution system ispresented and detailed. This fast key distribution system utilizes two layersof confidentially protection: 1) Physical noise intrinsic to the opticalchannel that turn the coded signals into stealth signals and 2) Privacyamplification using a bit pool of refreshed entropy run after run, to eliminateany residual information. The resulting level of security is rigorously calculated and demonstratesthat the level of information an eavesdropper could obtain is completelynegligible. The random bit sequences, fast and securely distributed, can beused to encrypt text, data or voice.
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