London-based Callsign has closed a $35 million Series A, led by Accel and early stage investor PTB Ventures, for an authentication platform which uses deep learning technology to power adaptive access control for enterprises — saying it can verify a person is who they say they are just from a swipe on a touchscreen. Other investors in the Series A include Allegis Capital and cybersecurity industry veteran David DeWalt’s NightDragon Security.

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