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引用次数: 0

摘要

:为了防止跟踪,蓝牙低功耗协议集成了地址随机化等隐私机制。然而,正如之前的研究所强调的那样,随机化并不是灵丹妙药,可以通过利用协议披露的其他类型的信息(如计数器或定时)来规避。在这项工作中,我们提出了一种新的攻击来破坏BLE中的地址随机化,利用以前未考虑过的侧信息:接收信号强度指示(RSSI)。更准确地说,我们展示了如何RSSI测量,从接收到的BLE广告数据包中提取,可以用来将同一设备发出的痕迹链接在一起,或者在地址随机化的情况下重新识别它。提出的攻击利用RSSI的分布来创建设备的指纹。对各种情况下的攻击进行了实证评估,证明了其有效性。例如,在静态环境中,设备保持在相同的位置,所提出的方法产生高达99%的重新识别精度,甚至可以通过增加对手控制的接收器数量来提高精度。
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RSSI-Based Fingerprinting of Bluetooth Low Energy Devices
: To prevent tracking, the Bluetooth Low Energy protocol integrates privacy mechanisms such as address randomization. However, as highlighted by previous researches address randomization is not a silver bullet and can be circumvented by exploiting other types of information disclosed by the protocol such as counters or timing. In this work, we propose a novel attack to break address randomization in BLE exploiting side information that has not been considered before: Received Signal Strength Indication (RSSI). More precisely, we demonstrate how RSSI measurements, extracted from received BLE advertising packets, can be used to link together the traces emitted by the same device or re-identify it despite address randomization. The proposed attack leverages the distribution of RSSI to create a fingerprint of devices. An empirical evaluation of the attack on various scenarios demonstrate its effectiveness. For instance in the static context, in which devices remain at the same position, the proposed approach yields a re-identification accuracy of up to 99%, which can even be boosted by increasing the number of receivers controlled by the adversary.
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