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Modèles de sécurité réalistes pour la distribution quantique de clés

Abstract : Since its invention in 1984 by C.H. Bennett and G. Brassard, the BB84 protocol has been proven secure against the most general attacks allowed by quantum mechanics, the coherent attacks. In order to conduct such an attack, an eavesdropper needs a quantum memory. It is however technologically very hard to create a quantum memory with adequate properties at the moment. It is therefore useful to study the evolution of the power of the eavesdropper when he doesn't have access to a perfect quantum memory but instead to a noisy quantum memory. New security models where the power of the eavesdropper is limited by the quality of its quantum memory have already been developed specifically for the study of two-party protocols like bit commitment or oblivious transfer. We therefore used these models and adapted them to the particular case of quantum key distribution. With these newly developed tools, we have studied the security of quantum key distribution protocols when the adversary doesn't have a quantum memory and when he has access to a limited amount of noisy memory. This research improves our knowledge on the interaction between the quality of the quantum memory and the power of the attacks. It leads to a better understanding of the tradeoff between performance (measured in term of key rate or maximum distance) and security.
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Submitted on : Monday, February 4, 2013 - 3:23:02 PM
Last modification on : Friday, July 31, 2020 - 10:44:09 AM
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  • HAL Id : pastel-00784705, version 1



Aurélien Bocquet. Modèles de sécurité réalistes pour la distribution quantique de clés. Physique Quantique [quant-ph]. Télécom ParisTech, 2011. Français. ⟨pastel-00784705⟩



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