Secret Key Distribution Based on Bounded Observability

Abstract

This paper reviews a secret key distribution based on 'Bounded Observability.' First, the secret key agreement from correlated sources is introduced. Next, the notion of Bounded Observability is introduced. This notion means the practical difficulty of completely observing physical phenomena that are too fast, or too large, or too complex. Finally, a secret key distribution scheme by using correlated physical randomness in lasers driven by common random light is introduced.