This is the system the government uses for its services, and is run by a government agency, so it is a robust as you could expect from such a system. In order to use it you need to apply for a password through your online banking or through the mail. That is then tied to your kennitala. If you are abroad, you can get access through an Icelandic embassy. Alternatively you can use the chip on your debit card along with a smart card reader to sign in, or if you have a special smart SIM card on you phone, you can use that as well. People should be able to use this system to claim for their children as well.