diff --git a/xCAT-IBMhpc/share/xcat/IBMhpc/pe/pe_install-1200 b/xCAT-IBMhpc/share/xcat/IBMhpc/pe/pe_install-1200
index f9261358d..8a1b1363c 100644
--- a/xCAT-IBMhpc/share/xcat/IBMhpc/pe/pe_install-1200
+++ b/xCAT-IBMhpc/share/xcat/IBMhpc/pe/pe_install-1200
@@ -90,8 +90,8 @@ fi
 
 #Generate checkpoint key and store it into the image, ckpt script could ust it after boot.
 if [ "$OS" != "AIX" ]; then
-    KEY=$(date | sha1sum | awk '{ print $1 }')
-    # KEY=$(dd if=/dev/random bs=1 | sha1sum | awk '{ print $1 }')
+    #KEY=$(date | sha1sum | awk '{ print $1 }')
+    KEY=$(dd if=/dev/random count=1 2>/dev/null | sha1sum | awk '{print $1}')
     echo $KEY > $installroot/root/.ckpt.key
     chmod 400  $installroot/root/.ckpt.key
 fi