Add reference to Jan'21 tech report

paper/rotohsm.bib

@@ -8,6 +8,15 @@
   isbn   = {978-1-119-64281-7},
 }
 
+@techreport{gs21,
+    author = {{\censorIfSubmission{Jan Sebastian Götte and Björn Scheuermann}}},
+    date = {2021-01-14},
+    institution = {{\censorIfSubmission{Alexander von Humboldt Institut für Internet und Gesellschaft}}},
+    title =  {Tech Report: Inerial HSMs Thwart Advanced Physical Attacks},
+    url = {https://eprint.iacr.org/2021/055},
+    urldate = {2021-04-13}
+}
+
 @techreport{smith1998,
 	author = {Sean Smith and Steve Weingart},
 	date = {1998-02-19},

paper/rotohsm_paper.tex

@@ -207,6 +207,10 @@ closest to a mechanical HSM that we were able to find during our research is an
 describes a mechanism to detect tampering along a communication cable by enclosing the cable inside a conduit filled
 with pressurized gas.
 
+In January 2020, we have uploaded an eprint of a short tech report with a rough description of the inertial HSM
+concept\cite{gs21}. Up to the time this paper was written, we have not received communication in response to this eprint
+that would indicate prior art.
+
 \subsection{Patent literature}
 During development, we performed several hours of research on prior art for the inertial HSM concept. Yet, we could not
 find any mentions of similar concepts either in academic literature or in patents. Thus, while we cannot give any