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@ -390,15 +390,16 @@ cases.
Sometimes, tamper-sensing meshes show up in other types of devices. We acquired two such devices. First, we acquired a
Neopost mail franking machine, a type of device that is used to directly print a code on an envelope that replaces a
conventional postage stamp. Since in businesses handling large volumes of mail these devices were routinely charged with large sums of
money in postage, such devices have security features ranging from physical seals on their enclosure to full security
meshes encasing their CPU modules. In case of Neopost, we are aware of one online source showing a security mesh inside
one such device~\cite{mikeselectricstuffNeopostPostalFranking2023}, but we found that our older specimen only contained
a sturdy cast zinc case that was welded shut with a spring-loaded lid switch inside. The other miscellaneous device we
found is a broken CPU module from a German slot machine manufacturer. While it would be reasonable to assume this type
of device might include active tamper sensing features to enforce state gambling regulations, other slot machine
manufacturers seem not to use tamper sensing in their systems so the more likely reason is DRM. Our specimen included
both a tamper-sensing mesh as well as a semiconductor junction light sensor inside of a sealed sheet metal enclosure.
conventional postage stamp. Since in businesses handling large volumes of mail these devices were routinely charged with
large sums of money in postage, such devices have security features ranging from physical seals on their enclosure to
full security meshes encasing their CPU modules. In case of Neopost, we are aware of one online source showing a
security mesh inside one such device~\cite{mikeselectricstuffNeopostPostalFranking2023}, but we found that our older
specimen only contained a sturdy cast zinc case that was welded shut with a spring-loaded lid switch inside. The other
miscellaneous device we found is a broken CPU module from a German slot machine manufacturer. While it would be
reasonable to assume this type of device might include active tamper sensing features to enforce state gambling
regulations, other slot machine manufacturers seem not to use tamper sensing in their systems so the more likely reason
is DRM. Our specimen included both a tamper-sensing mesh as well as a semiconductor junction light sensor inside of a
sealed sheet metal enclosure.
\subsection{Methodology}