One thing that Sony and Microsoft have had for quite some time is two factor authentication on PSN and Xbox Live. This allows you to keep your account event more secure by having a unique code texted to you when you sign into your account. It now appears that the option is available on your Nintendo account. Simply go to http://accounts.nintendo.com and log in to your Nintendo account. Then go to “Login and Safety Settings” and you should see it at the very bottom of the page. It seems to use Google Authentication. You can also change your ID if you wish.