--- a/.bashrc	Sat Oct 29 10:59:51 2016 +0800
+++ b/.bashrc	Sat Oct 29 11:00:57 2016 +0800
@@ -4,6 +4,8 @@
       *) return;;
 esac
 
+umask 0077
+
 # append to the history file, don't overwrite it
 shopt -s histappend