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A practical secret-key-distribution protocol using general phase fluctuations is described. A preshared key is assumed and is used only inside a transmitter and a receiver. The probabilistic property of signal-light fluctuations works with the preshared key to produce a difference in bit-error rate between a receiver and an eavesdropper. Using the difference, new secret keys are generated information theoretically although a preshared key is used. The probabilistic property of signal-lightdoi:10.1143/jjap.49.074401 fatcat:evit3nmf2jfp3pk4rz5xb3yehm