It would be nice to improve the authentication mechanisms in Ubuntu to be more user friendly and make it easier to enable modern authentication schemes. This will probably involve: - Reviewing the messages/prompts in PAM for appropriateness - Adding hints to PAM to allow GUIs to better display the prompts (i.e. if a prompt is for a password, key number, if prompting for a password change). - Improving the Unity Greeter prompts to interpret the hints - Improving PolicyKit to interpret the hints - Making it easier to enable non-password authentication (e.g. LDAP, two factor).