Security technology and the tightening of corporate networks have forced hackers to look elsewhere for vulnerabilities -- and they've found them in the employees sitting on the other side of the computer screen, experts say. Thanks to the proliferation of personal gadgets in the workplace, an abundance of information on sites such as LinkedIn and some employees' trusting natures, writers of malicious code increasingly are turning to techniques such as targeted e-mails to introduce malware into corporate networks.

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