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chapter-hsms/chapter.tex
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@ -318,8 +318,19 @@ considered sufficient by manufacturers.
\subsection{Mesh construction techniques}
We found that in almost all cases, practical tamper-sensing meshes are constructed using standard manufacturing
processes. In some card payment terminals, we found meshes that used slightly customized standard processes and e.g.
integrated a mesh layer produced in a carbon printing process into a membrane keypad, but customizations were minimal.
We only found one mesh manufactured in a bespoke process in the datacenter HSM appliance we examined, and that bespoke
process turns out to be a turnkey solution used by at least two HSM vendors.
\subsection{Mesh monitoring circuits}
We observed that in general, academic research leads before patent literature, which is ahead of actual implementations
in the field. Practical monitoring circuitry seems basic. Particularly the datacenter HSM appliance we examined showed a
contrast between a mesh manufactured in a bespoke process combined with a unsophisticated, discrete monitoring circuit
based around a number of voltage comparators.
\section{Conclusion}
In our survey, we have found a wide variety in tamper sensing mesh construction techniques. Meshes are commonly