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arxiv: quant-ph/0702152 · v2 · submitted 2007-02-15 · 🪐 quant-ph

Device-independent security of quantum cryptography against collective attacks

classification 🪐 quant-ph
keywords quantumcollectivedevice-independentsecurityamountassumptionsattackattacks
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We present the optimal collective attack on a Quantum Key Distribution (QKD) protocol in the "device-independent" security scenario, where no assumptions are made about the way the QKD devices work or on what quantum system they operate. Our main result is a tight bound on the Holevo information between one of the authorized parties and the eavesdropper, as a function of the amount of violation of a Bell-type inequality.

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