Reken, a cybersecurity startup cofounded by Google's former "click fraud czar" Shuman Ghosemajumder and Rich Griffiths in 2024, emerged from stealth with an on-device AI platform called the Reken Private Core. The system runs small, proprietary AI models directly on a user’s device rather than routing communications to the cloud, avoiding risks of data breaches and time lags. Ghosemajumder said the central R&D challenge was proving the AI models could produce high-quality results on standard corporate laptops without GPUs fast enough to block threats in real time. The first product built on the Private Core, Northstar, is designed as an alternative to corporate security-awareness training, using just-in-time AI to detect threats and verifying positive signals like legitimate senders rather than flagging AI-generated content. Reken raised $10 million in seed funding from venture firms including Greycroft and FPV Ventures. The FBI’s Internet Crime Complaint Center logged $20.9 billion in reported cybercrime losses in 2025—a 26% jump in a single year—and added AI-related crime as a category, recording more than 22,000 complaints.