Vi demonstrerar en praktisk attack där attackeraren aldrig upptäcks trots att denne helt kontrollerar systemet.
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Dessa kryphål har tidigare inte tagits på allvar, men denna avhandling visar hur även små svagheter i säkerhetsmodellen läcker information till en attackerare. Som ett svar på detta utvecklades apparatsoberoende kvantkryptering som i teorin är immun mot sådana attacker.Īpparatsoberoende kvantkryptering har en mycket högre grad av säkerhet än vanlig kvantkryptering, men det finns fortfarande ett par luckor som en attackerare kan utnyttja. Ett komplett bevis för denna säkerhet har dock låtit vänta på sig eftersom en attackerare i hemlighet kan manipulera utrustningen så att den läcker information.
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Denna insikt har gett upphov till kvantkryptering, en metod för två parter att med perfekt säkerhet kommunicera hemligheter. Abstract Įn viktig konsekvens av kvantmekaniken är att okända kvanttillstånd inte kan klonas.
#WHO PROVED THE NO CLONE THEOREM FULL#
We show how quantum money together with a blockchain allows for Quantum Bitcoin, a novel hybrid currency that promises fast transactions, extensive scalability, and full anonymity. Previously, quantum money assumes a traditional hierarchy where a central, trusted bank controls the economy. Here, the traditional copy-protection mechanisms of traditional coins and banknotes can be abandoned in favor of the laws of quantum physics. This important property of quantum mechanics can be seen as Nature's own copy-protection, and can also be used to create a currency based on quantummechanics, i.e., quantum money. Quantum key distribution is in part based on the profound no-cloning theorem, which prevents physical states to be copied at a microscopic level. Attack strategies are reviewed as well as their countermeasures, and we show how full security can be re-established. We study several relevant loopholes and show how they can be used to break the security of energy-time entangled systems. However, there still exist a number of loopholes that must be understood and eliminated in order to rule out eavesdroppers. This is a method for cryptography that promises not only perfect secrecy, but also to be a practical method for quantum key distribution thanks to the reduced complexity when compared to other quantum key distribution protocols.
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In this thesis we study device-independent quantum key distribution based on energy-time entanglement. 2017 (English) Doctoral thesis, comprehensive summary (Other academic) Abstract