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There is an article about keeping your Google account safe here on ITworld that addresses some of the security concerns raised by this question. http://www.itworld.com/security/436297/everything-you-need-know-about-ke...
No, Google has not been hacked. There was a dump of usernames and passwords on a Russian hacker site that included usernames and passwords likely gotten from smaller website hacks and malware on users’ computers, but Google reviewed this and found at most 2% of the could possibly be correct, but that most of those would not have gotten through Google’s automated anti-hijacking defences. For example, if you have logged on 100% of the time from Montana, and suddenly someone tries to access your account from Russia, that could raise a red flag. Apparently the
One of the unfortunate realities of the Internet today is a phenomenon known in security circles as “credential dumps”—the posting of lists of usernames and passwords on the web. We’re always monitoring for these dumps so we can respond quickly to protect our users. This week, we identified several lists claiming to contain Google and other Internet providers’ credentials.
We found that less than 2% of the username and password combinations might have worked, and our automated anti-hijacking systems would have blocked many of those login attempts. We’ve protected the affected accounts and have required those users to reset their passwords.
It’s important to note that in this case and in others, the leaked usernames and passwords were not the result of a breach of Google systems. Often, these credentials are obtained through a combination of other sources.
For instance, if you reuse the same username and password across websites, and one of those websites gets hacked, your credentials could be used to log into the others. Or attackers can use malware or phishing schemes to capture login credentials.
We’re constantly working to keep your accounts secure from phishing, malware and spam. For instance, if we see unusual account activity, we’ll stop sign-in attempts from unfamiliar locations and devices. You can review this activity and confirm whether or not you actually took the action.
A few final tips: Make sure you’re using a strong password unique to Google. Update your recovery options so we can reach you by phone or email if you get locked out of your account. And consider 2-step verification, which adds an extra layer of security to your account. You can visit g.co/accountcheckup where you’ll see a list of many of the security controls at your disposal.
Posted by Borbala Benko, Elie Bursztein, Tadek Pietraszek and Mark Risher, Google Spam & Abuse Team