diff --git a/build.fsx b/build.fsx
index feabb813..5c7170b5 100644
--- a/build.fsx
+++ b/build.fsx
@@ -470,6 +470,16 @@ Target "OpenBlasWinTest" DoNothing
 "OpenBlasWin64Build" ==> "OpenBlasWin64Test" ==> "OpenBlasWinTest"
 
 
+// --------------------------------------------------------------------------------------
+// CODE SIGN
+// --------------------------------------------------------------------------------------
+
+Target "Sign" (fun _ ->
+    let fingerprint = "5dbea70701b40cab1b2ca62c75401342b4f0f03a"
+    let timeserver = "http://time.certum.pl/"
+    sign fingerprint timeserver (!! "src/Numerics/bin/Release/**/MathNet.Numerics.dll" ))
+
+
 // --------------------------------------------------------------------------------------
 // PACKAGES
 // --------------------------------------------------------------------------------------
@@ -489,7 +499,7 @@ Target "Zip" (fun _ ->
         coreBundle |> zip "out/packages/Zip" "out/lib" (fun f -> f.Contains("MathNet.Numerics.") || f.Contains("System.Threading.") || f.Contains("FSharp.Core."))
     if hasBuildParam "signed" || hasBuildParam "release" then
         coreSignedBundle |> zip "out/packages/Zip" "out/lib-signed" (fun f -> f.Contains("MathNet.Numerics.")))
-"Build" ==> "Zip" ==> "Pack"
+"Build" =?> ("Sign", hasBuildParam "sign") ==> "Zip" ==> "Pack"
 
 Target "DataZip" (fun _ ->
     CleanDir "out/Data/packages/Zip"
@@ -533,7 +543,7 @@ Target "NuGet" (fun _ ->
     //    nugetPack coreSignedBundle "out/packages/NuGet"
     //if hasBuildParam "all" || hasBuildParam "release" then
     //    nugetPack coreBundle "out/packages/NuGet")
-"Build" ==> "NuGet" ==> "Pack"
+"Build" =?> ("Sign", hasBuildParam "sign") ==> "NuGet" ==> "Pack"
 
 Target "DataNuGet" (fun _ ->
     CleanDir "out/Data/packages/NuGet"
diff --git a/build/build-framework.fsx b/build/build-framework.fsx
index 17aa2767..b76dace1 100644
--- a/build/build-framework.fsx
+++ b/build/build-framework.fsx
@@ -202,6 +202,21 @@ let provideNuGetExtraFiles path (bundle:Bundle) (pack:Package) =
         provideFsLoader includes path
         provideFsIfSharpLoader path
 
+// SIGN
+
+let sign fingerprint timeserver files =
+    files
+    |> Seq.map (sprintf "\"%s\"")
+    |> Seq.map (fun file -> sprintf """sign /v /sha1 "%s" /t "%s" %s""" fingerprint timeserver file)
+    |> Seq.iter (fun arguments ->
+        let result =
+            ExecProcess (fun info ->
+                info.FileName <- """C:\Program Files (x86)\Windows Kits\10\bin\x86\signtool.exe"""
+                info.Arguments <- arguments) TimeSpan.MaxValue
+        if result <> 0 then
+            failwithf "Error during SignTool call ")
+
+
 // ZIP
 
 let zip zipDir filesDir filesFilter (bundle:Bundle) =