From 97036b3ac186b8cdbb8dbce88ae46069b835f156 Mon Sep 17 00:00:00 2001 From: jaseg Date: Mon, 19 May 2025 15:32:32 +0200 Subject: [PATCH] WIP --- paper.tex | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/paper.tex b/paper.tex index 590925a..b11fc2f 100644 --- a/paper.tex +++ b/paper.tex @@ -101,7 +101,10 @@ superconducting states up to spin states, all QKD protocols are based on photoni that can easily be transferred across long distances through optical fiber. Even so, QKD protocols face a steep trade-off between speed of key generation--called \emph{secret key rate}--and distance since quantum states cannot be amplified. In literature on long-range QKD, secret key rates as low as $10$ milli-bits per second are routinely -published\cite{wangTwinfieldQuantumKey2022}. +published\cite{wangTwinfieldQuantumKey2022} since they already promise a benefit over classical key exchange or key +encapsulation methods using asymmetric cryptography in a hypothetical scenario in which symmetric cryptography cannot +yet be efficiently attacked using Grover's algorithm, but all asymmetric cryptography has fallen to quantum algorithms +like variants of Shor's algorithm. \subsection{Loss in optical fibers} @@ -205,10 +208,16 @@ observe the fiber's minimum bending radius, which for common fibers is usually i \section{Multi-fiber passthrough with active secondary mesh} -\textcite{gotteCantTouchThis2022} list some \emph{shielding} methods that use a independently rotating secondary tamper -sensing mesh on the inside of the primary mesh, located right next to the primary mesh's axis opening. In this paper, we -present three variations of an IHSM optical fiber pass through: A simple disc cover, offset labyrinth meshes, and -interlocking gear meshes. \subsection{Simple disc cover} +To approach the security of the data and power connections passing through the IHSM's unprotected shaft, +\textcite{gotteCantTouchThis2022} list some shielding methods that use a independently rotating secondary tamper sensing +mesh on the inside of the primary mesh, located right next to the primary mesh's axis opening. This secondary mesh +makes accessing the payload using probes inserted through the shaft much more difficult. +\textcite{gotteCantTouchThis2022} only present conceptual drawings of these schemes, and focus on electrical signals. In +this paper, building on these concepts, we present mechanical designs of three variations of an IHSM pass through that +are adapted to the limited bending radius of optical fiber: A simple disc cover, offset labyrinth meshes, and +interlocking gear meshes. We present a mechanical prototype of our offset labyrinth mesh design. + +\subsection{Simple disc cover} \begin{figure}[h!] \centering