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Andrew Weisburd, an online activist who tracks terrorist groups, said he believes al-Qaeda began using this technique to communicate after the rights expired to alneda.com, a website often linked to al-Qaeda.
What is unusual, say security specialists, is that the operators of the innocent websites are often unaware of the intrusion until well after the fact, because the data is place on a hidden file that can only be accessed with the correct code.
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