Yahoo attack places spotlight on identity management

http://en.wikipedia.org/wiki/Yahoo

The attack on Yahoo that started with the theft of user credentials from a third-party database highlights the risk of sharing usernames and passwords across multiple websites.

Yahoo reported Thursday that attackers using computer software used the stolen credentials to log into Yahoo Mail accounts and search for names and email addresses on sent emails. Upon discovering the attack, Yahoo shutdown access to the affected accounts, alerted users and asked that they reset their passwords.

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Story added 3. February 2014, content source with full text you can find at link above.