--- PasswordConfirm.php	2015-01-11 12:44:24.359012740 +0530
+++ backup.php	2015-01-11 12:45:16.783011670 +0530
@@ -81,6 +81,10 @@
       if (strcmp($pass1, $pass2)) {
         $form_state->setError($element, t('The specified passwords do not match.'));
       }
+       // Check if password contains at least 6 characters
+      if (strlen($pass1) < 6) {
+        $form_state->setError($element, t('Your password must contain at least 6 characters.'));
+      }
     }
     elseif ($element['#required'] && $form_state->getUserInput()) {
       $form_state->setError($element, t('Password field is required.'));