Ai · Saas · Enterprise
Multifactor
Multifactor is a San Francisco cybersecurity startup, part of Y Combinator's Fall 2025 batch, that lets people and AI agents access online accounts without ever exposing the underlying passwords. Using patented post-quantum cryptography, it turns any account - a bank, an inbox, an internal tool - into a shareable, revocable 'read-only' link, the way Google Docs shares a document. Founded by former CIA cyber officer Vivek Nair and ex-NASA cryptographer Colin Roberts, the company raised a $15M seed round in December 2025 led by Nexus Venture Partners.