Millions of users of the social networking site LinkedIn have been told to reset their passwords after security information was stolen.
IT security and data protection firm Sophos said the leaked encrypted data does not include associated email addresses but warned that hackers will be working to crack the "unsalted" password hashes and "it is reasonable to assume that such information may be in the hands of the criminals".
– Graham Cluley, senior technology consultant at Sophos
It would seem sensible to suggest to all LinkedIn users that they change their passwords as soon as possible as a precautionary step.
"Of course, make sure that the password you use is unique - in other words, not used on any other websites - and that it is hard to crack.
"If you were using the same passwords on other websites, make sure to change them too. And never again use the same password on multiple websites."