diff --git a/.gitignore b/.gitignore
index bebb0b7..94db856 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /challenge/*.o
 /doorchallenge
+/dooris.conf
diff --git a/dooris.conf.sample b/dooris.conf.sample
new file mode 100644
index 0000000..256d7a5
--- /dev/null
+++ b/dooris.conf.sample
@@ -0,0 +1 @@
+password=sesamaenderdich
diff --git a/lock b/lock
index aab2903..a050e64 100755
--- a/lock
+++ b/lock
@@ -1,4 +1,5 @@
 #!/bin/sh
+source shared
 
 echo "Initializing Space Systems..."
 echo "22" > /sys/class/gpio/unexport
@@ -9,7 +10,7 @@ echo "out" > /sys/class/gpio/gpio22/direction
 sleep 0.5
 echo "Open Communication Channel..."
 # Silent, Output to /dev/null, Timeout after 5s and retry 12 times, each doubling the waitingtime until ten minutes.
-curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=sesamaenderdich&action=close" &
+curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=${password}&action=close" &
 echo "Locking Space..."
 echo "1" > /sys/class/gpio/gpio22/value
 sleep 0.3
diff --git a/shared b/shared
new file mode 100755
index 0000000..449bc67
--- /dev/null
+++ b/shared
@@ -0,0 +1,13 @@
+#!/bin/sh
+config="dooris.conf"
+
+# warn if local config file is missing
+if [ ! -f "${config}" ]; then
+	echo "WARNING: ${config} is missing!" >&2
+fi
+
+# get password config value in a safe way
+password="$(grep password ${config} 2>/dev/null|cut -d= -f2|tr -d ' \t')"
+if [ -z "${password}" ]; then
+	echo "WARNING: password in ${config} is missing!" >&2
+fi
diff --git a/unlock b/unlock
index 58d4b22..19f1eae 100755
--- a/unlock
+++ b/unlock
@@ -1,4 +1,5 @@
 #!/bin/sh
+source shared
 
 echo "Initializing Space Systems..."
 echo "27" > /sys/class/gpio/unexport
@@ -8,7 +9,7 @@ echo "Securing Communication to Space Systems..."
 echo "out" > /sys/class/gpio/gpio27/direction
 sleep 0.5
 echo "Open Communication Channel..."
-curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=sesamaenderdich&action=open" &
+curl -s -o /dev/null -m 5 --connect-timeout 5 --retry 12 "hamburg.ccc.de/dooris/status.php?apikey=${password}&action=open" &
 echo "Unlocking Space..."
 echo "1" > /sys/class/gpio/gpio27/value
 sleep 0.3