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Seoul-based cybersecurity firm making OTAC one-time authentication for securing operational technology and connected devices.
Founded in 2015 and headquartered in Seoul, South Korea, SSenStone Inc. develops authentication technology for operational technology security. Its flagship OTAC, a one-time authentication code system, is offered to sectors including finance, IoT, smart buildings and automotive, with clients such as banks and technology companies. Revenue comes mainly from subscriptions and licensing, including its Algorithm as a Service model. In June 2026 the company raised an undisclosed amount from Hyundai Motor Company.
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