Coherent attacks on a practical quantum oblivious transfer protocol

Abstract

In a recent quantum oblivious transfer protocol proposed by Nagy et al., it was proven that attacks based on individual measurements and 2-qubit entanglement can all be defeated. Later we found that 5-body entanglement-based attacks can break the protocol. Here we further tighten the security bound, by showing that the protocol is insecure against 4-body entanglement-based attacks, while being immune to 3-body entanglement-based attacks. Also, increasing the number of qubits in the protocol is useless for improving its security.

Fixed-Time Synchronization of Markovian Switching Stochastic Complex Networks via Quantized Aperiodically Intermittent Control

“…Different from synchronization of finite-time, Polyakov [12] put forward the synchronization theory fixed-time in 2012, whose stabilization time is only related to the control parameters. Since then, people have continuously enriched and improved the fixed-time synchronization theory [13][14][15][16][17][18][19]. Lopez-Ramirez et al [13] discussed the stable conditions of fixedtime in continuous autonomous systems.…”

“…Literature [16] using state-dependent switching neural networks events trigger control with communication delay to solve the porblem of stabilization. Moreover, research results of synchronization of fixed-time in complex networks such as neural networks [17] and multi-agent systems with hybrid attack [18,19] provide some solutions for the actual control of real networks.…”