Untappable Key Distribution System: a One-Time-Pad Booster

Abstract

<p>The One-Time-Pad (OTP) protocol gives unconditional security<br />for the information being encrypted. Correctly implemented, not even<br />an adversary with a quantum computer can crack it. However, the need<br />of sharing in a secure way supplies of symmetric random keys turned the<br />method almost obsolete as a stand-alone method for fast and large volume<br />telecommunication. Basically, this secure sharing of keys and their<br />renewal, once exhausted, had to be done through couriers, in a slow and<br />costly process. This paper presents a solution for this problem providing a<br />fast and unlimited renewal of secure keys: An untappable key distribution<br />system is presented and detailed. This fast key distribution system utilizes<br />two layers of confidentially protection: 1) Physical noise intrinsic to the optical<br />channel that turn the coded signals into stealth signals and 2) Privacy<br />amplification using a bit pool of refreshed entropy run after run, to eliminate<br />any residual information. The resulting level of security is rigorously<br />calculated and demonstrates that the level of information an eavesdropper<br />could obtain is negligible. The random bit sequences, fast and securely<br />distributed, can be used to encrypt text, data or voice.</p>