Cuong Le Quoc, Patrick Bellot and Akim Demaille. On the security of quantum networks: a proposal framework and its capacity. In the proceedings of the 2007 International Conference on New Technologies, Mobility and Security (NTMS'07). Paris, France, May 2007

In large Quantum Key Distribution (QKD)-based networks, intermediate nodes are necessary because of the short length of QKD links. They have tendency to be used more than classical networks. A realistic assumption is that there are eavesdropping operations in these nodes without knowledge of legitimate network participants. We develop a QKD-based network framework. We present a percolation-based approach to discuss about conditions of extremely high secret key transmission. We propose also an adaptive stochastic routing algorithm that helps on protecting keys from reasonable eavesdroppers in a dense QKD network. We show that under some assumptions, one could prevent eavesdroppers from sniffing the secrets with an arbitrarily large probability.

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