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LeakedIn': Was Your LinkedIn Password Hacked?

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"...with that combination, they can begin to commit crimes."

LONDON (The Blaze/AP) — Business social network LinkedIn said Wednesday that some of its users' passwords have been stolen and leaked onto the Internet.

LinkedIn Corp. did not say how many of the more than six million passwords that were distributed online corresponded to LinkedIn accounts. In a blog post Wednesday, the company said it was continuing to investigate.

Graham Cluley, a consultant with U.K. Web security company Sophos, recommended that LinkedIn users change their passwords immediately. Those who were hacked should not be able to use their no compromised password anyway. CBS has more on how compromised accounts will be notified:

1. Members that have accounts associated with the compromised passwords will notice that their LinkedIn account password is no longer valid.

2. These members will also receive an email from LinkedIn with instructions on how to reset their passwords. There will not be any links in these emails. For security reasons, you should never change your password on any website by following a link in an email.

3. These affected members will receive a second email from our Customer Support team providing a bit more context on this situation and why they are being asked to change their passwords.

LinkedIn has a lot of information on its more than 160 million members, including potentially confidential information related to jobs being sought. Companies, recruiting services and others have accounts alongside individuals who post resumes and other professional information.

A site called "LeakedIn.org" has been created to allow you to check if your password has been compromised. Although, it is usually not recommended to start entering your password into random searches, even if it's to confirm a breach or not.

There's added concern that many people use the same password on multiple websites, so whoever stole the data could use the information to access Gmail, Amazon, PayPal and other accounts, Cluley said. The Verge reports a Russian forum has claimed responsibility.

Before confirming the breach, LinkedIn issued security tips as a precautionary measure. The company said users should change passwords at least every few months and avoid using the same ones on multiple sites.

LinkedIn also had suggestions for making passwords stronger, including avoiding passwords that match words in a dictionary. One way is to think of a meaningful phrase or song and create a password using the first letter of each word.

Cluley said hackers are working together to break the encryption on the passwords.

"All that's been released so far is a list of passwords and we don't know if the people who released that list also have the related email addresses," he said. "But we have to assume they do. And with that combination, they can begin to commit crimes."

LinkedIn's blog post had few details about what happened. It said compromised passwords have been deactivated, and members with affected accounts will be sent emails with further instructions.

While the passwords appear to be encrypted, security researcher Marcus Carey warned that users should not take solace from such security measures.

"If a website has been breached, it doesn't matter what encryption they're using because the attacker at that point controls a lot of the authentication," said Carey, who works at security-risk assessment firm Rapid7. "It's 'game over' once the site is compromised."

Cluley warned that LinkedIn users should be careful about malicious email generated around the incident. The fear is that people, after hearing about the incident, would be tricked into clicking on links in those emails. Instead of getting to the real LinkedIn site to change a password, it would go to a scammer, who can then collect the information and use it for criminal activities.

LinkedIn said its emails will not include any links.

Shares of LinkedIn, which is based in Mountain View, California, gained 8 cents to close Wednesday at $93.08.

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