If your password gets stolen as part of a data breach, you’ll probably be told. But what if your password gets pwned some other way?

n case you’ve never heard of it, Have I Been Pwned, or HIBP as it is widely known, is an online service run out of Queensland in Australia by a data breach researcher called Troy Hunt.

The idea behind HIBP is straightforward: to give you a quick way of checking your own online accounts against data breaches that are already known to be public.

Of course, you’d hope that a company that suffered a data breach would let you know itself, so you wouldn’t need a third party website like HIBP to find out.

But there are numerous problems with relying on the combined goodwill and ability of a company that’s just suffered a breach, not least that the scale of the breach might not be obvious at first, if the company even realises at all.

And even if the company does do its best to identify the victims of the breach, it may not have up-to-date contact data for you; its warning emails might get lost in transit; or it might not be sure which users were affected.