In Pictures: The biggest Internet security challenges of 2013

From the attack on privacy and Cryptolocker to Eric Snowden and the NSA, it's been a challenging year

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The European nonprofit spam filtering company Spamhaus reportedly fended off DDoS, or distributed denial-of-service attacks, that briefly took the site offline in March and caused widespread congestion on the Web. Spamhaus creates blacklists of servers that spammers use to send messages for e-mail providers, so providers can then filter spam for their users.

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In Pictures: The biggest Internet security challenges of 2013

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