--- a/ui/main.cpp	Fri Nov 21 18:33:31 2014 +0100
+++ b/ui/main.cpp	Fri Nov 21 18:33:58 2014 +0100
@@ -74,6 +74,7 @@
 
 int main(int argc, char **argv)
 {
+  time_t signed_time = 0;
 #ifdef WIN32
     /* First verify integrity even before calling QApplication.
      * We only do this on Windows as we have a PKCS#7 embedded
@@ -82,7 +83,7 @@
      * On GNU/Linux platforms you should use an IDS system to
      * monitor executable corruptions.
      */
-    if (!selftest()) {
+    if (!selftest(&signed_time)) {
         syslog_error_printf("Integrity check failed.");
         MessageBoxW(NULL,
                 L"TrustBridge wurde nach der Installation modifizert.\n"
@@ -188,6 +189,12 @@
         app.setFont(font);
     }
 
+    if (signed_time != 0 && signed_time != -1) {
+        QDateTime sigTime = QDateTime::fromTime_t(signed_time);
+        QSettings settigs;
+        settings.setValue("Software/currentSigDt", sigTime);
+    }
+
     MainWindow mainWin(trayMode);
 
     return app.exec();

--- a/ui/mainwindow.cpp	Fri Nov 21 18:33:31 2014 +0100
+++ b/ui/mainwindow.cpp	Fri Nov 21 18:33:58 2014 +0100
@@ -280,10 +280,20 @@
     }
     bin_verify_result verifyResult = verify_binary(swFileName.toUtf8().constData(),
             swFileName.toUtf8().size());
-    qDebug() << "Binary verify result: " << verifyResult.result;
-    if (verifyResult.result != VerifyValid) {
+    QDateTime sigDt = QDateTime::fromTime_t (verifyResult.sig_time);
+    QDateTime currentSigDt = mSettings.value("Software/currentSigDt").toDateTime();
+
+    if (verifyResult.result != VerifyValid || (currentSigDt.isValid() && sigDt <= currentSigDt)) {
         handleLTE(lteInvalidSoftware);
-        qDebug() << "Failed to verify downloaded data.";
+        if (verifyResult.result != VerifyValid) {
+            qDebug() << "Failed to verify downloaded data.";
+        } else {
+            qDebug() << "Software update was signed at: " << sigDt;
+            qDebug() << "But the installed software was signed on: " << currentSigDt;
+            if (verifyResult.fptr) {
+                fclose(verifyResult.fptr);
+            }
+        }
         QFile::remove(swFileName);
         mSettings.remove("Software/available");
         mSettings.remove("Software/availableDate");
@@ -414,9 +424,23 @@
     bin_verify_result vres = verify_binary(filePath.toUtf8().constData(),
             filePath.toUtf8().size());
 
-    if (vres.result != VerifyValid) {
+    QDateTime sigDt = QDateTime::fromTime_t (vres.sig_time);
+    QDateTime currentSigDt = mSettings.value("Software/currentSigDt").toDateTime();
+
+    if (vres.result != VerifyValid || (currentSigDt.isValid() && sigDt <= currentSigDt)) {
         handleLTE(lteInvalidSoftware);
-        qDebug() << "Invalid software. Not installing";
+        if (vres.result != VerifyValid) {
+            qDebug() << "Failed to verify installer.";
+        } else {
+            qDebug() << "Software update was signed at: " << sigDt;
+            qDebug() << "But the installed software was signed on: " << currentSigDt;
+            if (vres.fptr) {
+                fclose(vres.fptr);
+            }
+        }
+        QFile::remove(filePath);
+        mSettings.remove("Software/available");
+        mSettings.remove("Software/availableDate");
         return;
     }
     handleLTE(lteInvalidSoftware, true);