(Bloomberg View) -- It's a near-certainty that your organization's computer system has been or will be broken into. And even if you're security-conscious and vigilant, you may be to blame.

The overwhelming majority of hacks -- including the huge Sony attack of 2014, the recent intrusions into the U.S. Democratic National Committee's network and, probably, the $81 million Bangladesh Bank heist that pointed to security flaws in the SWIFT bank transfer data network -- all have one thing in common: They started with phishing, an old and tired "social engineering" technique. A link is sent out on e-mail, a social network or a messaging app, someone opens it -- and hackers gain access to the network by infecting it with malware.

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