From Halopedia, the Halo wiki
Decades after the Sundered Legion's defeat by the UNSC, the Prowler was discovered by Saskia Nazari and Victor Gallardo. When Dorian Nguyen attempted to activate the ship, it read his DNA and identified Dorian as Quinn Butain who Dorian suspected to be his great-grandfather. Spartan-III Owen-B096 suggested that Dorian, as a descendant of Quinn, had a close enough DNA match to fool the Prowler's systems. As a result, Dorian was capable of flying the ship and overriding the self-destruct which was activated when the Prowler detected Owen.
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