Fast Readout and Low Power Consumption in Capacitive Touch Screen Panel by Downsampling

Gao, Shuo; Lai, Jackson; Nathan, Arokia

doi:10.1109/jdt.2016.2599001

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…Importantly, the power footprint of the soft keyboard keystrokes is distinguishable from other screen touches. Thus, the information leaks in the power signature may have several sources: capacitive touchscreen, text postprocessing or the related software stack [9,11]. To identify the real source, we connect a Bluetooth keyboard to the phone and measure the power while typing text with the soft keyboard displayed on the screen, with the predictive dictionary and autocorrection activated.…”

Section: Keystroke Inferencementioning

confidence: 99%

Power to peep-all: Inference Attacks by Malicious Batteries on Mobile Devices

Lifshits

Forte

Hoshen

et al. 2018

Proceedings on Privacy Enhancing Technologies

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Mobile devices are equipped with increasingly smart batteries designed to provide responsiveness and extended lifetime. However, such smart batteries may present a threat to users’ privacy. We demonstrate that the phone’s power trace sampled from the battery at 1KHz holds enough information to recover a variety of sensitive information. We show techniques to infer characters typed on a touchscreen; to accurately recover browsing history in an open-world setup; and to reliably detect incoming calls, and the photo shots including their lighting conditions. Combined with a novel exfiltration technique that establishes a covert channel from the battery to a remote server via a web browser, these attacks turn the malicious battery into a stealthy surveillance device. We deconstruct the attack by analyzing its robustness to sampling rate and execution conditions. To find mitigations we identify the sources of the information leakage exploited by the attack. We discover that the GPU or DRAM power traces alone are sufficient to distinguish between different websites. However, the CPU and power-hungry peripherals such as a touchscreen are the primary sources of fine-grain information leakage. We consider and evaluate possible mitigation mechanisms, highlighting the challenges to defend against the attacks. In summary, our work shows the feasibility of the malicious battery and motivates further research into system and application-level defenses to fully mitigate this emerging threat.

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Section: Keystroke Inferencementioning

confidence: 99%