A simple password-less authentication protocol for web sites

Many sites have features that are only accessible after registering a user account on them. These sites include forums, on-line games, corporate intranets and non-public utility sites amongst others.

These sites are typically secured through a system whereby a user chooses both a unique user name and a password that will be used to authenticate them.

The system I propose here is more convenient for users, and in many cases more secure by removing the requirement for the user to choose or remember a password.