Quantum hacking of two-way continuous-variable quantum key distribution using Trojan-horse attack

• 作 者: 马鸿鑫 鲍皖苏 李宏伟 周淳
• 机 构: PLA Information Engineering University,Synergetic Innovation Center of Quantum Information and Quant
• 出 处: Chinese Physics B
• 发表日期: 2016年08期
• 关键词: Trojan horse modulator redundancy render parties crosstalk inserting simplicity

We present a Trojan-horse attack on the practical two-way continuous-variable quantum key distribution system. Our attack mainly focuses on the imperfection of the practical system that the modulator has a redundancy of modulation pulsewidth, which leaves a loophole for the eavesdropper inserting a Trojan-horse pulse. Utilizing the unique characteristics of two-way continuous-variable quantum key distribution that Alice only takes modulation operation on the received mode without any measurement, this attack allows the eavesdropper to render all of the final keys shared between the legitimate parties insecure without being detected. After analyzing the feasibility of the attack, the corresponding countermeasures are put forward.

We present a Trojan-horse attack on the practical two-way continuous-variable quantum key distribution system. Our attack mainly focuses on the imperfection of the practical system that the modulator has a redundancy of modulation pulsewidth, which leaves a loophole for the eavesdropper a Trojan-horse pulse. Utilizing the unique characteristics of two-way continuous-variable quantum key distribution that Alice only takes modulation operation on the received mode without any measurement, this attack allows the eavesdropper to render all of the final keys shared between the the parties investigator without being detected. After analyzing the feasibility of the attack, the corresponding countermeasures are forward.