Abstract
While the embedded security research community aims to protect systems by reducing analog sensor side channels, our work argues that sensor side channels can be beneficial to defenders. This work introduces the general problem of synthesizing virtual sensors from existing circuits to authenticate physical sensors' measurands. We investigate how to apply this approach and present a preliminary analytical framework and definitions for sensor side channels. To illustrate the general concept, we provide a proof-of-concept case study to synthesize a virtual inertial measurement unit from a camera motion side channel. Our work also provides an example of applying this technique to protect facial recognition against silicon mask spoofing attacks. Finally, we discuss downstream problems of how to ensure that side channels benefit the defender, but not the adversary, during authentication.
Abstract (translated)
尽管嵌入式安全研究社区旨在通过减少模拟传感器侧通道来保护系统,但我们的工作指出,传感器侧通道可能对维护者有益。这项工作介绍了合成现有电路中的虚拟传感器到验证物理传感器测量的一般问题。我们研究如何应用这种方法,并提供了传感器侧通道的初步分析框架和定义。为了展示一般概念,我们提供了从相机运动侧通道合成虚拟惯性测量单元的原型案例研究。我们的工作还提供了一个应用这种方法保护面部识别免受硅口罩伪造攻击的示例。最后,我们讨论了如何确保在验证期间侧通道对维护者有益而不会对对手有益的问题。
URL
https://arxiv.org/abs/2301.11745
