diff --git a/fhem/FHEM/91_sequence.pm b/fhem/FHEM/91_sequence.pm
index 55a88ed93..a14af53e7 100644
--- a/fhem/FHEM/91_sequence.pm
+++ b/fhem/FHEM/91_sequence.pm
@@ -23,6 +23,7 @@ sequence_Initialize($)
     reportEvents:1,0
     triggerPartial:1,0 
     showtime:1,0
+    strictSequence:1,0
   );
   use warnings 'qw';
   $hash->{AttrList} = join(" ", @attrList);
@@ -79,11 +80,17 @@ sequence_Notify($$)
   my $events = deviceEvents($dev, AttrVal($ln, "addStateEvent", 0));
   return if(!$events);
   my $max = int(@{$events});
+  my $strictSequence = AttrVal($ln, "strictSequence", 0);
 
   for (my $i = 0; $i < $max; $i++) {
     my $s = $events->[$i];
     $s = "" if(!defined($s));
-    next if($n !~ m/^$re$/ && "$n:$s" !~ m/^$re$/);
+    if($n !~ m/^$re$/ && "$n:$s" !~ m/^$re$/) {
+      next if(!$strictSequence && $hash->{IDX});
+      RemoveInternalTimer($ln);
+      sequence_Trigger($ln, "abort-strict");
+      return "";
+    }
 
     RemoveInternalTimer($ln);
     $hash->{last_source} = $n;
@@ -169,12 +176,12 @@ sequence_Undef($$)
 =item summary_DE generiert Event nach Empfang einer definierten Event-Sequenz
 =begin html
 
-<a name="sequence"></a>
+<a id="sequence"></a>
 <h3>sequence</h3>
 <ul>
   <br>
 
-  <a name="sequencedefine"></a>
+  <a id="sequence-define"></a>
   <b>Define</b>
   <ul>
     <code>define &lt;name&gt; sequence &lt;re1&gt; &lt;timeout1&gt;
@@ -219,20 +226,21 @@ sequence_Undef($$)
   </ul>
   <br>
 
-  <a name="sequenceset"></a>
+  <a id="sequence-set"></a>
   <b>Set</b> <ul>N/A</ul><br>
 
-  <a name="sequenceget"></a>
+  <a id="sequence-get"></a>
   <b>Get</b> <ul>N/A</ul><br>
 
-  <a name="sequenceattr"></a>
+  <a id="sequence-attr"></a>
   <b>Attributes</b>
   <ul>
     <li><a href="#addStateEvent">addStateEvent</a></li>
     <li><a href="#disable">disable</a></li>
     <li><a href="#disabledForIntervals">disabledForIntervals</a></li>
-    <li><a href="#showtime">showtime</a></li>
-    <li><a href="#triggerPartial">triggerPartial</a><br>
+
+    <a id="sequence-attr-triggerPartial"></a>
+    <li>triggerPartial</a><br>
       if set (to 1), and not all the events of a sequence are received, then a
       partial_X event is generated by the sequence. Example:<br><code><ul>
       fhem> define seq sequence d1:on 1 d1:on 1 d1:on<br>
@@ -243,17 +251,28 @@ sequence_Undef($$)
       tasks for a single button, depending on the number of times it is
       pressed.
       </li><br>
-    <li><a href="#reportEvents">reportEvents</a><br>
+
+    <a id="sequence-attr-reportEvents"></a>
+    <li>reportEvents<br>
       if set (to 1), report the events (space separated) after the
       "trigger" or "partial_X" keyword. This way one can create more general
       sequences, and create different notifies to react:<br>
       <ul><code>
-        define seq sequence remote:btn.* remote:btn.*<br>
+        define seq sequence remote:btn.* 1 remote:btn.*<br>
         attr seq reportEvents<br>
         define n_b1b2 notify seq:trigger.remote:btn1.remote:btn2 set lamp1 on<br>
         define n_b2b1 notify seq:trigger.remote:btn2.remote:btn1 set lamp1 off<br>
       </code></ul>
-      </li>
+      </li><br>
+
+    <a id="sequence-attr-strictSequence"></a>
+    <li>strictSequence<br>
+      if set (to 1), any "unexpected" event will reset the sequence. This may
+      be helpful to avoid brute-force attacks.<br>
+      Note: it will only work as correctly if the sequence is triggering only
+      to the configured devices (check the NOTIFYDEV internal), and the source
+      is not generating "undesired" events together with the desired ones.
+      </li><br>
   </ul>
   <br>
 
@@ -263,12 +282,12 @@ sequence_Undef($$)
 
 =begin html_DE
 
-<a name="sequence"></a>
+<a id="sequence"></a>
 <h3>sequence</h3>
 <ul>
   <br>
 
-  <a name="sequencedefine"></a>
+  <a id="sequence-define"></a>
   <b>Define</b>
   <ul>
     <code>define &lt;name&gt; sequence &lt;re1&gt; &lt;timeout1&gt;
@@ -312,21 +331,21 @@ sequence_Undef($$)
   </ul>
   <br>
 
-  <a name="sequenceset"></a>
+  <a id="sequence-set"></a>
   <b>Set</b> <ul>N/A</ul><br>
 
-  <a name="sequenceget"></a>
+  <a id="sequence-get"></a>
   <b>Get</b> <ul>N/A</ul><br>
 
-  <a name="sequenceattr"></a>
+  <a id="sequence-attr"></a>
   <b>Attributes</b>
   <ul>
     <li><a href="#addStateEvent">addStateEvent</a></li>
     <li><a href="#disable">disable</a></li>
     <li><a href="#disabledForIntervals">disabledForIntervals</a></li>
-    <li><a href="#showtime">showtime</a></li>
 
-    <li><a href="#sequencetriggerPartial">triggerPartial</a><br>
+    <a id="sequence-attr-triggerPartial"></a>
+    <li>triggerPartial<br>
       Falls gesetzt (auf 1), und nicht alle erwarteten Events eingetroffen
       sind, dann wird ein partial_X Event generiert, wobei X durch Anzahl der
       eingetroffenen Events ersetzt wird. Beispiel:<br><code><ul>
@@ -339,18 +358,30 @@ sequence_Undef($$)
       gedr&uuml;ckt wurde.
       </li><br>
 
-    <li><a href="#sequencereportEvents">reportEvents</a><br>
+    <a id="sequence-attr-reportEvents"></a>
+    <li>reportEvents<br>
       Falls gesetzt (auf 1), meldet trigger die empfangenen Events (Leerzeichen
       getrennt) nach dem "trigger" oder "partial_X" Schl&uuml;sselwort.
       Das kann verwendet werden, um generische sequence Instanzen zu definieren:
       <br>
       <ul><code>
-        define seq sequence remote:btn.* remote:btn.*<br>
+        define seq sequence remote:btn.* 1 remote:btn.*<br>
         attr seq reportEvents<br>
         define n_b1b2 notify seq:trigger.remote:btn1.remote:btn2 set lamp1 on<br>
         define n_b2b1 notify seq:trigger.remote:btn2.remote:btn1 set lamp1 off<br>
       </code></ul>
-      </li>
+      </li><br>
+
+    <a id="sequence-attr-strictSequence"></a>
+    <li>strictSequence<br>
+      Falls gesetzt ist (auf 1), jedes "unerwartete" Event setzt die
+      Verarbeitung zur&uuml;ck. Das kann bei sog. Brute-Force Attacken helfen.
+      <br>
+      Achtung: es funktioniert nur dann wie erwartet, wenn die Definition nur
+      auf die konfigurierten Geraete triggert (siehe das NOTIFYDEV Internal),
+      und die Quelle generiert nur die gew&uuml;nschten Events (kein
+      Zeitstempel, ACK, etc).
+      </li><br>
   </ul>
   <br>