The proposed icon is hard to parse. Better an open lock? And maybe in orange instead of jarring red. Or even better, make the secure icon something universally

The proposed icon is hard to parse. Better an open lock? And maybe in orange instead of jarring red. Or even better, make the secure icon something universally positive, like a green smiley face or a check mark. Then the insecure icon can be an orange sad face or X mark. (Lock icon can be ambiguous to non-techies. i.e. why is the url locked? or is that a suitcase/purse?)