diff --git a/Info.plist b/Info.plist
index a1fcb5be..0719c149 100644
--- a/Info.plist
+++ b/Info.plist
@@ -41,5 +41,7 @@
         <true/>
 	<key>OSAScriptingDefinition</key>
 	<string>OpenSCAD.sdef</string>
+        <key>SUPublicDSAKeyFile</key>
+        <string>dsa_pub.pem</string>
 </dict>
 </plist>
diff --git a/appcast-snapshots.xml.in b/appcast-snapshots.xml.in
index 31035655..f46c8148 100644
--- a/appcast-snapshots.xml.in
+++ b/appcast-snapshots.xml.in
@@ -11,6 +11,7 @@
       <enclosure url="https://openscad.googlecode.com/files/OpenSCAD-@VERSION@.dmg"
                  sparkle:version="@VERSIONDATE@"
                  sparkle:shortVersionString="@VERSION@"
+                 sparkle:dsaSignature="@DSASIGNATURE@"
                  length="@FILESIZE@" 
                  type="application/octet-stream"/>
     </item>
diff --git a/appcast.xml.in b/appcast.xml.in
index e375fae7..f61710cc 100644
--- a/appcast.xml.in
+++ b/appcast.xml.in
@@ -11,6 +11,7 @@
       <enclosure url="https://openscad.googlecode.com/files/OpenSCAD-@VERSION@.dmg"
                  sparkle:version="@VERSIONDATE@"
                  sparkle:shortVersionString="@VERSION@"
+                 sparkle:dsaSignature="@DSASIGNATURE@"
                  length="@FILESIZE@"
                  type="application/octet-stream"/>
     </item>
diff --git a/dsa_pub.pem b/dsa_pub.pem
new file mode 100644
index 00000000..f0aee275
--- /dev/null
+++ b/dsa_pub.pem
@@ -0,0 +1,12 @@
+-----BEGIN PUBLIC KEY-----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+-----END PUBLIC KEY-----
diff --git a/openscad.pro b/openscad.pro
index a4678205..7b55a14c 100644
--- a/openscad.pro
+++ b/openscad.pro
@@ -66,7 +66,7 @@ macx {
   ICON = icons/OpenSCAD.icns
   QMAKE_INFO_PLIST = Info.plist
   APP_RESOURCES.path = Contents/Resources
-  APP_RESOURCES.files = OpenSCAD.sdef
+  APP_RESOURCES.files = OpenSCAD.sdef dsa_pub.pem
   QMAKE_BUNDLE_DATA += APP_RESOURCES
   LIBS += -framework Cocoa -framework Sparkle
 }
@@ -323,7 +323,6 @@ macx {
              src/EventFilter.h \
              src/AutoUpdater.h \
              src/SparkleAutoUpdater.h \
-             src/CocoaInitializer.h \
              src/CocoaUtils.h
   SOURCES += src/AppleEvents.cc \
              src/AutoUpdater.cc
diff --git a/scripts/publish-macosx.sh b/scripts/publish-macosx.sh
index 2fe85d42..306f1cd7 100755
--- a/scripts/publish-macosx.sh
+++ b/scripts/publish-macosx.sh
@@ -32,13 +32,15 @@ if [[ $? != 0 ]]; then
   exit 1
 fi
 
+SIGNATURE=$(openssl dgst -sha1 -binary < OpenSCAD-$VERSION.dmg  | openssl dgst -dss1 -sign dsa_priv.pem | openssl enc -base64)
+
 if [[ $VERSION == $VERSIONDATE ]]; then
   APPCASTFILE=appcast-snapshots.xml
 else
   APPCASTFILE=appcast.xml
 fi
 echo "Creating appcast $APPCASTFILE..."
-sed -e "s,@VERSION@,$VERSION,g" -e "s,@VERSIONDATE@,$VERSIONDATE,g" -e "s,@FILESIZE@,$(stat -f "%z" OpenSCAD-$VERSION.dmg),g" $APPCASTFILE.in > $APPCASTFILE
+sed -e "s,@VERSION@,$VERSION,g" -e "s,@VERSIONDATE@,$VERSIONDATE,g" -e "s,@DSASIGNATURE@,$SIGNATURE,g" -e "s,@FILESIZE@,$(stat -f "%z" OpenSCAD-$VERSION.dmg),g" $APPCASTFILE.in > $APPCASTFILE
 cp $APPCASTFILE ../openscad.github.com
 if [[ $VERSION == $VERSIONDATE ]]; then
   cp $APPCASTFILE ../openscad.github.com/appcast-snapshots.xml