School technology leaders and other education stakeholders should beware of an insidious new practice among computer hackers: sending eMail messages infected with dangerous computer viruses posing as attachments from legitimate companies, such as software from the Walt Disney Co. or security patches distributed by leading internet protection firms.

Called "eMail spoofing," this little-known but increasingly popular tactic—through which hackers are able to disguise the true origin of their messages by impersonating taglines belonging to major companies—is among the internet's most prevalent dangers, security experts have warned.

Spoofing, they say, has...

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