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Layout Dependent Phenomena A New Side-channel Power Model

Dyrkolbotn, Geir Olav; Wold, Knut; Snekkenes, Einar
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/142552
Date
2012
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  • Institutt for informasjonssikkerhet og kommunikasjonsteknologi [1599]
Original version
Dyrkolbotn, G. O., K. Wold&E. Snekkenes (2012) Layout Dependent Phenomena A New Side-channel Power Model. In: Journal of Computers, 7(4), p. 827-837.   http://dx.doi.org/10.4304/jcp.7.4.827-837
Abstract
The energy dissipation associated with switching

in CMOS logic gates can be used to classify the microprocessor’s

activity. In VLSI design, layout dependent phenomena,

such as capacitive crosstalk, become a major contributor

to the power consumption and delays of on-chip busses

as transistor technology get smaller. These effects may be

known to the security community but have received little

attention.

In a recent paper we presented a new power model, taking

into consideration capacitive crosstalk. We have shown

that capacitive crosstalk has a significant effect on gate

energy dissipation. Our results confirm that the dissipated

energy from CMOS switching gates depends not only on

the hamming distance (HD), but also on the direction of

switching activity on nearby data lines. We show that for an

8 bit data bus, crosstalk may improve detection performance

from 2.5 bits (HD based detector) to a theoretical 5.7 bits and

simulated 5.0 bits (crosstalk based detector) of information

per sample.

In this paper we elaborate on the theory and simulations

of layout dependent phenomena and how they must be

considered when analyzing security implications of power

and electromagnetic side-channels. We have also added a

small case study, i.e. the electromagnetic side-channel of a

smart card, that supports our simulations/theoretical results.
Description
This is the journal's version originally published in Journal of Computers: http://dx.doi.org/10.4304/jcp.7.4.827-837. This is an open access journal. Reprinted with permission from Academy Publisher.
Publisher
Academy Publisher
Journal
Journal of Computers

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