In order to protect its users, LinkedIn has sent many of those affected an email telling them that their current password had been invalidated and advising it be reset. The company also suggested people use extra security measures on their accounts, such as two-step verification, to make sure hackers have trouble getting in.
After the data breach happened in 2012, LinkedIn reset the passwords of over 6 million users, but apparently did not suspect that emails had been stolen too.
According to Motherboard, the hacker that stole the LinkedIn credentials put them up for sale on an illegal marketplace on the dark web with a price tag of 5 bitcoins, equlling about $2,200. All of the passwords were encrypted, or "hashed," but one of Motherboard's sources said they had cracked 90% of the passwords in three days.
To be safe, LinkedIn suggests you change your account password even if you haven't received an email suggesting you do so.
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