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Computer Sciences Corporation

Baltimore startup Maddrix lands on list of NSA cybersecurity experts

When federal databases containing sensitive information on U.S. intelligence or nuclear weapons come under cyberattack, the agencies call on major companies like Lockheed Martin, Verizon and Booz Allen Hamilton — as well as a two-year-old startup in Federal Hill — to shore up defenses.

Maddrix LLC is among seven companies to be the first ones accredited in a new National Security Agency vetting program. The firms use complex data analysis and digital forensics to root out invaders that are lurking or have left behind tracks during their intrusions.

The NSA increasingly relies on contractors to scour for, contain and repair data breaches by what are known as "advanced...