Security maven Troy Hunt has created a web site that allows you to test your email to see if you have been “pwned” by recent security break-ins of user database lists. Check your email address to see if you have been “pwned!”
“Just after the Adobe breach, a number of sites started popping up that let you search through the breach to see if your email address (and consequently your password), was leaked. For example there was this one by Ilias Ismanalijev, here’s another by Lucb1e and even LastPass got on the bandwagon with this one. When I used the tool to check my accounts, I found both my personal and work accounts contained in the breach. I had absolutely no idea why!
The most likely answer is that I did indeed create accounts on Adobe, perhaps as far back as in the days when I was using Dreamweaver to build classic ASP whilst it was still owned by Macromedia. The point is that these accounts had been floating around for so long that by the time a breach actually occurred I had no idea that my account had been compromised because the site was simply no longer on my radar.
But of course Adobe is not the only searchable breach online, there’s also one for Gawker, another for LinkedIn passwords (emails and usernames weren’t disclosed) and so on and so forth. Problem is, there’s not a tool to search across multiple breaches, at least not that I’ve found which is why I’ve built haveibeenpwned.com”