LONDON (AP) — Business social network LinkedIn said it is investigating reports that more than six million passwords have been stolen and leaked onto the Internet.
Although LinkedIn did not confirm if any user data had been hacked or leaked, researchers at U.K. Web security company Sophos say they have confirmed that a file posted online does contain, in part, LinkedIn passwords "hashes." That's a way of encrypting or storing passwords in a different form.
Graham Cluley, a consultant with Sophos, recommended that LinkedIn users change their passwords immediately.
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.
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.
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."
It wasn't known who was behind such an attack.
LinkedIn Corp. referred repeated requests for comment to the company's Twitter feed, where it said its team was "looking into reports of stolen passwords."
Two hours later, the company posted a second tweet saying that it was still unable to confirm if a security breach had occurred.
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."
He said that if the breach is confirmed, he expects LinkedIn to require users to change their passwords with the threat of locking them out of the site if they don't. Full containment of a breach would only be possible if every single password is changed or users are disabled, he said.
Cluley also 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.
Shares of LinkedIn, which is based in Mountain View, California, fell 36 cents, or 0.4 percent, to $92.64 in early afternoon trading Wednesday.
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This Week’s Celebrity Instagrams (11/26-12/2)
30 photos Launch gallery
1. Little Legend and Puddy 😍😍😍😍
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2. "You on point Phife?" "all the time,Tip". 💥 #bannedfromnormal
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3. Vegan! The Impossible burger at Crossroads
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4. Lawrence #BeforeandAfterEpisodes 1-4: 184lbs 13% body fatEpisode 8: 196lbs 8% body fat S/O @coachdaveboxing with the works outs and @kildareriordan with the nutrition
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5. Jus haaaanngin out
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6. Meanwhile back at home in Atlanta GA someone mad they not on the 🛳. 😳
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7. No limits... Photo cred: Chris Bridges @ludacris
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8. new new
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9. Apparently my 260lbs is too much for the actual vines in the Hawaiian jungles to hold me without breaking and me falling hundreds of feet. So for safety purposes, I'm forced to swing thru #Jumanjj on wires strong enough to hold 12 adult buffaloes and 1 adult Rock. #OnSet #Jumanji #IronicallyIEatBuffaloDailyForLunch #MoreManThanNatureKnowsWhatToDoWith
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10. hey ma! 🎎#wcw 💙
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11. Surprise visit to our factories!!! #GoodAmerican #USA
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13. Peachy Keen 🔥✨⚡️
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14. If this don't look thankful I don't know what does. Happy Thanksgiving to you and yours. #UltraBlessed #24kMagic #SweetPotatoFly
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15. Late nights @nbcmarlon with the writers... we in here!!!
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16. There goes my baaaaaaaaabbbbyyyyy #QueenKingMagic!!! We're up to something! Ira BIG!!! Stay out our buisness -
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17. You want to win every game you play but when you come home to these faces... who cares. #ILoveYouGirls best part of my day, everyday!
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18. Steady,steady..... full size jenga.. "I got this one "???? Or do I ?
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19. Cornrows kind of day 😉@dontaysavoy2 you convinced me and I love. ❤️️
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20. #BrotherlyLove #tbt
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22. #basel #TeamLOVE @kingcombs
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23. Just introduced a special screening of @directher 's groundbreaking (must see) documentary @13thfilm with my brother @themichaelealy | @unitedblackout #blackoutblackfriday
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24. Me & Vanessa Williams giving #DuckLips #Pose on the set of #DaytimeDivas @vh1 - Coming Soon to a tv near you. Lol. - My make up done by @makeupsurgeon
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25. This picture just makes me wanna praise the Lord, you hear me!!!!!! Yes Lord brotha #TEDDYCAMPBELL What a #man !!! You are everything right on this picture husband ......... #gorgeous #stylish #classy #strong #masculine #king #sexy #debonair #gentlemenstyle And that #bible in your hand just seals the deal for me (probably cause i know that, that is what helped you become just as amazing as you look😘). While my heart and mind experiences the goodness of God at #church on Sundays, my eyes experiences the goodness of Teddy😍. Amen somebody🙌🏽. "Bless the Lord oh my soul and all that is within me bless his holy name" #myman #myhusband #goodman #blackman #dapperman #godlyman #goodfather #mybestfriend
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26. Yesterday was my mama's 53rd birthday!!!!! Got to celebrate with her all day. If this is what I have to look forward to I can't wait. Looking like a soft bucket a cocoa butter. Yaaaaaaaaaas! 😍😍😍 love you mommy!
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27. "Shout out to @PureAtlanta for getting the family right"....I'm loving this jogger. 😍😍
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28. This pic warms my heart ❤️ #myLogiebeans and aunt aunt umba @itowandabraxton 😘
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29. You will always be my baby😜. #HappyBirthdayReginae #mybaby18
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30. GC "Gods Child" Red on Red SweatSuit available now at www.MonicaApparel.com ... Take Your Crown wherever you go!! I'm pictured in a Medium... Go to the site now for other options ... cc: @trukernell
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