Multifactor, a post-quantum security platform designed to safeguard online accounts for both humans and AI agents, has secured a $15 million seed round amid accelerating demand for provably secure, shareable account access. The financing was led by Nexus Venture Partners, with participation from Y Combinator, Taurus Ventures, Honeystone Ventures, Flex Capital, Pioneer Fund, Ritual Capital, Liquid2 Ventures, and several prominent operators in security, AI, and enterprise software, including Mohan and Padma Warrior, Gokul Rajaram, and Mathilde Collin.
The funding follows rapid early adoption of Multifactor’s technology, which enables users to share access to online accounts without revealing underlying credentials. The company’s approach replaces traditional password managers by converting any online account into a secure, revocable, one-click access link similar to sharing permissions in Google Docs. Banking platforms, email, calendars, social media, and enterprise systems can all be turned into shareable read-only or limited-permission links. Permissions can be customized by feature or dollar amount, and all activity is recorded with cryptographic signatures and protected through Multifactor’s post-quantum security.
Ph.D. computer scientist and former CIA officer Vivek Nair and Ph.D. mathematician and cryptographer Colin Roberts founded Multifactor. The founders created the platform in response to emerging risks stemming from the rapid adoption of agentic AI. For AI agents, Multifactor provides a controlled execution environment resistant to prompt injection, password theft, confused-deputy scenarios, and cross-agent hijacking. Access is capability-based, ensuring that agents can only view or modify what users explicitly authorize.
The company launched publicly three weeks ago, built on a decade of cybersecurity research and informed by the founders’ experience with offensive and defensive tooling in high-risk national security settings. With identity at the center of most application security breaches, Multifactor is positioning itself as a next-generation zero-trust solution that replaces fragile and fragmented credential-based systems with cryptographically guaranteed authorization.
Investors cite Multifactor’s trust-building capabilities as a major driver of its market potential, particularly as organizations seek secure ways to collaborate with autonomous AI systems. The company’s platform, which includes a free account manager, is now available to the public.
KEY QUOTES:
“Passwords were never built for the agentic era, and they’re becoming the most fragile link in modern security. People aren’t going to hand AI agents the keys to their calendars, finances, or business systems unless they have complete confidence nothing will go wrong. Multifactor is the easiest, safest, and most verifiable way to collaborate with both humans and AI with security guarantees that are mathematically unbreakable.”
Vivek Nair, CEO and Co-Founder of Multifactor
“Multifactor is solving a multi-billion-dollar problem. Adoption of any new technology starts with trust. That, ultimately, is what Multifactor is bringing to the table. They’re creating trust. And by doing that, they’re eliminating one of the most significant barriers to mainstream adoption of agentic AI.”
Abhishek Sharma, Managing Director at Nexus Venture Partners
