The Mitre Corporation

Joseph J Rushanan

Nicholas C Donnangelo

David Gervais

Marvin D Drake

Christophe F Bas

Substantially identical numerical sequences known only to stations A and B are generated in a manner not subject to duplication by an eavesdropper and not subject to cryptanalytic attack because they are not derived using a mathematical function (such, as for example, factoring). The sequences are independently derived utilizing a physical phenomena that can only be 'measured' precisely the same at stations A and B. Signals are simultaneously transmitted from each station toward the other through a communication channel having a characteristic physical property capable of modifying the signals in a non-deterministic way, such as causing a phase shift. Each signal is 'reflected' by the opposite station back toward its station of origin. The effect of the communication channel is &#x201c;measured&#x201d; by comparing original and reflected signals. Measured differences are quantized and expressed as numbers.

Generating identical numerical sequences utilizing a physical property and secure communication using such sequences

Methods and systems relating to Weil-based spreading codes are described herein. In an embodiment, a method includes generating a set of Weil sequences, adapting a plurality of sequences of the set of Weil sequences to form a first plurality of codes, and selecting a second plurality of codes from the first plurality of codes. A code of the first plurality of codes is selected based at least on a correlation associated with the code. Each code of the first plurality of codes has a predetermined length.

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Bedford, MA, United States of America

Joseph J Rushanan