22 million user IDs may be in the hands of hackers, after Yahoo Japan security breach

Graham Cluley

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The call has gone out to Yahoo Japan’s 200 million users to change their passwords, after the company warned that it suspected hackers had managed to access a file containing 22 million user IDs.

Read more in my article on Sophos’s Naked Security blog.

Graham Cluley Graham Cluley is a veteran of the anti-virus industry having worked for a number of security companies since the early 1990s when he wrote the first ever version of Dr Solomon's Anti-Virus Toolkit for Windows. Now an independent security analyst, he regularly makes media appearances and is an international public speaker on the topic of computer security, hackers, and online privacy. Follow him on Twitter at @gcluley, or drop him an email.