Power, frequency and bandwidth, it can transmit data with a variety of analog Signals, arbitrarily modulated in amplitude/frequency/phase. Noise-SDR uses a leakage-based fully-digital software-defined approach to shapeĮlectromagnetic noise produced by unprivileged software into generic radio thor22-psk125.mp4 hamdrm.mp4 sstv.mp4 Noise-SDR in a nutshell Interestingly, the ability to transmit using existing protocols with a software defined approach opens the potential for applications other than covert channels, for example, trying to inject data in a victim receiver. We also demonstrate the possibility to transmit at longer distance and more reliably. This allows to build more diverse and resilient transmitters and even allows to use protocols written for software defined radios, despite some limitations in power, frequency, and bandwidth. With Noise-SDR we demonstrate that by controlling software running on the device, we can generate arbitrary modulations (using a technique known as RF-PWM). Existing covert channels are usually using simple modulations, for example, On Off Keying (make noise or not), to transmit information, which are simple to implement but also not very robust.
Such covert channels are limited in power and bandwidth, and, more importantly, they can transmit only on the frequencies where the leakage is present (e.g. This effect is well known for EM side channel attacks (or Tempest attacks) that exploit it to spy on the device, but also for building covert channels: a piece of code on the device controls the noise generated by the device to transmit information (Soft-Tempest). "Noise-SDR: Arbitrary Modulation of Electromagnetic Noise from Unprivileged Software and Its Impact on Emission Security" to appear at IEEE S&P 2022.Įlectronic devices emit some unintended radio noise when working, this is usually known as Electro Magnetic (EM) noise (or EM leakage). Giovanni Camurati and Aurélien Francillon.
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