Marcus Ranum

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Marcus Ranum is a computer security expert. As of mid-2010, he is at Tenable Security.


He worked for Digital Equipment where he implemented the first commercially available firewall product, SEAL. He later worked at Trusted Information Systems, where he designed the firewall for the site and the TIS firewall toolkit which evolved into the open source Gauntlet firewall.

Intrusion detection

He founded the company Network Flight Recorder and designed their main product, an intrusion detection system.