diff --git a/chapter-hsms/chapter.tex b/chapter-hsms/chapter.tex index 9acb3b1..71f8830 100644 --- a/chapter-hsms/chapter.tex +++ b/chapter-hsms/chapter.tex @@ -217,8 +217,6 @@ A 1969 NCR patent is the earliest mention we were able to find of such a tamper-sensing mesh being implemented in a printed circuit process instead of by laying out a physical wire. -\subsection{Hardware Security Module Applications} - \section{A Survey of Meshes in the Wild} Concluding the brief history of tamper sensing meshes above, we find that they were initially developed for sensitive @@ -306,6 +304,22 @@ Sometimes, tamper-sensing meshes show up in other types of devices. We acquired 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. +\section{Findings} + +\subsection{Tamper-sensing meshes then and now} + +Concluding both our patent research and our experimental survey, we find that tamper-sensing meshes have been a +commonplace technology throughout the past 150 years. While mesh manufacturing technology has experienced some +advancements from historical wire-wound meshes to modern meshes always being constructed in printed circuit processes, +mesh monitoring approaches have received surprisingly little attention through the centuries and even in recent, +state-of-the-art systems, a simple comparator monitoring a mesh arranged in a wheatstone bridge configuration is still +considered sufficient by manufacturers. +% FIXME todo above: show wheatstone bridge schematic + +\subsection{Mesh construction techniques} + +\subsection{Mesh monitoring circuits} + \section{Conclusion} In our survey, we have found a wide variety in tamper sensing mesh construction techniques. Meshes are commonly