Quiz access rules: Safe Exam Browser quiz access rule
quizaccess_safeexambrowser
This quiz access rule plugin provides Safe Exam Browser 2.0 integration for Moodle.
Maintained by: 
Tim Hunt
This quiz access rule was created by Tim Hunt at the Open University. It provides Safe Exam Browser 2.0 integration for Moodle. It can be used with versions 2.3.7 of Moodle, or later. (For Moodle 2.4, you should be using 2.4.4 or later.)
If you install this plugin, there is a new option 'Allowed browser exam keys' on the quiz settings form where you can enter valid keys for version of SEB that should be allowed to attempt the quiz. There is also a new capability 'Not required to use Safe Exam Browser'. Users with that capability (by default teachers and above) are exempt from the secure browser check.
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I am trying this plugin,but I got stuck at this part:
"Once the plugin is installed, there is a new setting Allowed browser keys on the quiz settings form, in the Extra restrictions on attempts section. Here you can enter a list of keys, one per line. A browser key is a 64-character hex string, and the form validation verifies that the keys are like that, and that all the keys given are different."
Where do I find that key?
Basic support for SEB1.9 is in standard Moodle. You need to enable it under Experimental features in the admin menu, then you get a setting Browser security -> require SEB in the quiz.