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The Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange system has beenintroduced as a simple, very low cost and efficient classical physicalalternative to quantum key distribution systems. The ideal system uses only afew electronic components - identical resistor pairs, switches andinterconnecting wires - to guarantee perfectly protected data transmission. Weshow that a generalized KLJN system can provide unconditional security even ifit is used with significantly less limitations. The more universal conditionsease practical realizations considerably and support more robust protectionagainst attacks. Our theoretical results are confirmed by numericalsimulations.

Generalized Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange system using arbitrary resistors