​Back when I was a contract firewall installer for Trusted Information Systems, we had a phrase for the way a lot of companies looked at connected networks: Mallomars. If you’re not familiar, Mallomars are a cookie with a hard, crunchy outer layer of graham cracker and chocolate and soft gooey marshmallow inside. And “Mallomar” companies thought that if they installed a strong enough firewall — that hard, crunchy outer layer — they didn’t need to worry about security on the inside. What happened? Internal networks were not secured—like the gooey marshmallow in the center of a Mallomar.

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