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Achieving Unconditional Security in Existing Networks Using Quantum Cryptography.



Based on extensions to the protocols PPP and IPSEC, we present a working proposal for building a network over which messages can be sent unconditionally secure. We will show how quantum cryptography can be implemented in classical protocols and how existing networks can be efficiently extended to suit our needs for unconditional security. We show that graph connectivity is crucial for the security of the transmission. For that matter, we provide secure routing services, so an adversary cannot penetrate any message flow successfully. Furthermore, our protocols are extensible to allow up to t-1 adversaries (possibly cooperating) while remaining unconditionally secure.
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Conference Paper
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This paper presents extensions to the classical point-to-point protocol PPP [RFC1661] and IPSEC [RFC 2401] in order to build networks that can do unconditionally secure message relay. Our work addresses the problem of how to integrate quantum key distribution (QKD) in networks such that little effort needs to be put on protocol engine adaption and network topology design. This article demonstrates how to ensure correct routing and secure authentication between adjacent QKD-capable nodes, in particular, it is demonstrated how a person-in-the-middle attack can be countered using universal hash functions.
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