diff --git a/Open.snk b/Open.snk
new file mode 100644
index 0000000..22a3cbd
Binary files /dev/null and b/Open.snk differ
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 1a1064e..526cf5d 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -12,6 +12,8 @@
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <PackageOutputPath>$(RepoRoot)artifacts/</PackageOutputPath>
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
+    <AssemblyOriginatorKeyFile>$(RepoRoot)\Open.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
   </PropertyGroup>
 
   <ItemGroup>