OSPF key-chain authentication

In this lab i am trying to secure my link through key-chain authentication

Router1(config)#interface serial 0/1/0
Router1(config-if)#ip ospf authentication
Router1(config-if)#ip ospf authentication-key admin

Router2(config)#interface serial 0/1/0
Router2(config-if)#ip ospf authentication
Router2(config-if)#ip ospf authentication-key admin