diff --git a/cg_init_machine.sh b/cg_init_machine.sh
index 2223e5a..2795cdf 100644
--- a/cg_init_machine.sh
+++ b/cg_init_machine.sh
@@ -11,3 +11,4 @@ echo '%wheel ALL=(ALL:ALL) NOPASSWD:    ALL' | EDITOR='tee -a' visudo
 mkdir -p /home/cg_maintain_user/.ssh
 touch /home/cg_maintain_user/.ssh/authorized_keys
 chown -R cg_maintain_user:cg_maintain_user /home/cg_maintain_user
+chmod 600 /home/cg_maintain_user/.ssh/authorized_keys