Side-channels have traditionally been exploited as a means of uncovering sensitive information such as cryptographic keys from a computing device. In particular, past work has shown that electromagnetic (EM) radiation from a device’s processor and memory during the execution of code and data can be used by attackers to extract private information. In contrast, instead of considering side-channels and electromagnetic radiation as vulnerabilities, we see them as opportunities for wireless communication on resource-limited IoT devices. We present SideComm, a side-channel-based communication system that leverages processors’ EM side-channels to enable resource-limited IoT devices to wirelessly send their data without having any radios. The main advantage of this approach is completely eliminating the need for a conventional radio and antenna, which offers energy savings, simplicity, and flexibility for IoT devices. Our evaluation demonstrates SideComm’s ability to achieve a communication range of more than 10m (enabling ≥ 3 dB SNR at 15m) and to work in non-line-of-sight scenarios, such as around corners and through walls. We believe SideComm can enable increased connectivity for many resource-constrained IoT devices in smart environments.

Traditionally, side channels have been exploited to uncover sensitive information such as cryptographic keys from computing devices. An attacker can extract private information from a device’s processor and memory by using electromagnetic (EM) radiation while code and data are being executed. Rather than seeing side-channels and electromagnetic radiation as vulnerabilities, we consider them as potential wireless communication channels for resource-constrained devices. The main advantage of this approach is completely eliminating the need for a conventional radio and antenna, which offers energy savings, simplicity, and flexibility for resource-constrained devices.