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| Authors: | Davide B. Bartolini, Philipp Miedl and Lothar Thiele |
| Group: | Computer Engineering |
| Type: | Inproceedings |
| Title: | On the Capacity of Thermal Covert Channels in Multicores |
| Year: | 2016 |
| Month: | April |
| Book Titel: | EuropeanConference on Computer Systems (EuroSys) 2016 |
| Keywords: | covert channel, thermal, capacity bound, transmission scheme, achievable rate |
| Abstract: | Modern multicore processors feature easily accessible tem- perature sensors that provide useful information for dynamic thermal management. These sensors were recently shown to be a potential security threat, since otherwise isolated applications can exploit them to establish a thermal covert channel and leak restricted information. Previous research showed experiments that document the feasibility of (low- rate) communication over this channel, but did not further analyze its fundamental characteristics. For this reason, the important questions of quantifying the channel capacity and achievable rates remain unanswered. To address these questions, we devise and exploit a new methodology that leverages both theoretical results from in- formation theory and experimental data to study these ther- mal covert channels on modern multicores. We use spectral techniques to analyze data from two representative plat- forms and estimate the capacity of the channels from a source application to temperature sensors on the same or different cores. We estimate the capacity to be in the order of 300 bits per second (bps) for the same-core channel, i.e., when reading the temperature on the same core where the source application runs, and in the order of 50 bps for the 1- hop channel, i.e., when reading the temperature of the core physically next to the one where the source application runs. Moreover, we show a communication scheme that achieves rates of more than 45 bps on the same-core channel and more than 5 bps on the 1-hop channel, with less than 1% error probability. The highest rate shown in previous work was 1.33 bps on the 1-hop channel with 11% error probability. |
| Location: | EuroSys16, London, UK |
| Resources: | [BibTeX] [ External LINK ] |
