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We survey the most important results and some recent developments about thesecure key exchange protocol where the security is based on the Second Law ofThermodynamics and the robustness of classical physical information. Weconclude that a classical physical system offers a higher level of control andsecurity during the communication. We also mention some recent attemptsinspired by this communicator to create other systems where Alice and Bob donot form an organic single system and/or the Second Law is irrelevant. It seemsphilosophically that they cannot be unconditionally secure, however it is yetan open question how to crack them; how can they be best used for conditionallysecure communications, and what are the practical implications.

Absolutely Secure Communications by Johnson-like Noise and Kirchhoff's Laws