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We investigate the security of continuous-variable (CV) quantum keydistribution (QKD) using coherent states and reverse reconciliation againstGaussian individual attacks based on an optimal Gaussian $1 \to 2$ cloningmachine. We provide an implementation of the optimal Gaussian individualattack. we also find a Bell-measurement attack which works without delayedchoice of measurements and has better performance than the cloning attack.Comment: RevTeX, 2 figure

Cloning and optimal Gaussian individual attacks for a continuous-variable quantum key distribution using coherent states and reverse reconciliation