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This research advances practical quantum cryptography by replacing complex trapdoor functions with simpler one-way group actions for eavesdropper-blind remote state preparation. The breakthrough enables secure quantum public-key encryption using classical communication channels without relying on the security of a quantum server. This shift toward more efficient mathematical primitives could accelerate the deployment of widely applicable cryptographic schemes in real-world networks.

Source coveringQuantum Zeitgeist

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Edinburgh Team Builds Eavesdropper-Blind State Preparation

Quantum ZeitgeistAugust 24, 20264 min read

Previously reliant upon complex ‘trapdoor’ functions, constructing remote state preparation is now achievable using simpler one-way group actions. This work demonstrates an eavesdropper-blind variant, removing reliance on quantum server security, yet still sufficient for practical quantum public-key encryption with classical communication channels. Adapting established protocols unlocks new avenues towards more efficient and widely applicable cryptographic schemes.

Quantum cryptography now includes eavesdropper-blind remote state preparation, or EB-RSP, enabling classical parties to remotely construct quantum states using purely classical communication. Kaniuar Bacho and Alexandru Cojocaru, both from the University of Edinburgh, define this relaxed form of standard remote state preparation as sufficient for building quantum public-key encryption with classical keys and quantum ciphertexts. A refined method for remotely preparing quantum states eases some previous restrictions. This ‘eavesdropper-blind’ approach still enables secure encryption but…

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