Hi Thomas, you might want to take a look at our new MFA plugin which lets you set up security questions on login as well as other factors and it works with any exisitng authentication plugin.
https://moodle.org/plugins/tool_mfa
We're also working on a security questions plugin that allows you to prompt the user with security questions when they try to perform certain actions, such as changing or recovering passwords. at this stage it only operates on the Moodle Password reset page, but could be extended easily to other forms.
You can see this plugin as a work in progress in our git repository here:
https://github.com/catalyst/moodle-tool_securityquestions
https://moodle.org/plugins/tool_mfa
We're also working on a security questions plugin that allows you to prompt the user with security questions when they try to perform certain actions, such as changing or recovering passwords. at this stage it only operates on the Moodle Password reset page, but could be extended easily to other forms.
You can see this plugin as a work in progress in our git repository here:
https://github.com/catalyst/moodle-tool_securityquestions