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SMPC chapter WIP, add missing photos

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jaseg 2025-12-03 16:47:44 +01:00
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chapter-ihsm/chapter.tex
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@ -343,12 +343,16 @@ shaft penetrates the mesh to simplify mechanical construction.
The spinning mesh must be designed to cover the entire surface of the payload, but it suffices if it sweeps over every
part of the payload once per rotation. This means we can design longitudinal gaps into the mesh that allow outside air
to flow through to the payload. In traditional boundary-sensing HSMs, cooling of the payload processor is a serious
issue since any air duct or heat pipe would have to penetrate the HSM's security boundary. This problem can only be
solved with complex and costly siphon-style constructions, so in commercial systems, heat conduction is used
exclusively~\cite{isaacs2013}. This limits the maximum power dissipation of the payload and thus its processing power.
Using longitudinal gaps in the mesh, our setup allows direct air cooling of regular heatsinks. This unlocks much more
powerful processing capabilities that greatly increase the maximum possible power dissipation of the payload. In an
evolution of our design, the spinning mesh could even be designed to \emph{be} a cooling fan.
issue since any air duct or heat pipe would have to penetrate the HSM's security boundary~\cite{
petriePartIITechnical,
curetHardwareSecurityModule2025,
zhangTamperrespondentAssembliesPorous2023,
dragoneVentedTamperrespondentAssemblies2020}.
This problem can only be solved with complex and costly siphon-style constructions, so in commercial systems, heat
conduction is used exclusively~\cite{isaacs2013}. This limits the maximum power dissipation of the payload and thus its
processing power. Using longitudinal gaps in the mesh, our setup allows direct air cooling of regular heatsinks. This
unlocks much more powerful processing capabilities that greatly increase the maximum possible power dissipation of the
payload. In an evolution of our design, the spinning mesh could even be designed to \emph{be} a cooling fan.
Conventional HSMs are limited by the construction of their security meshes which rely on plastics as their main
structural material. The security mesh has to fit the highest components inside the HSM. Since creating a security mesh