A lot depends on local laws, rules and regs. There are aircraft on "secret" flight plans within the UK and, no doubt, countless other countries.
If a politician/ head of state decreed that details of a certain flight should be "restricted" and details only known to those involved then what right did the controller have to reveal them? Why should anyone on here publish the details? It might do more harm than good for the unfortunate, but thoughtless, controller.