Multifactor (YC F25)

Can't believe we get to work with such amazing partners like Nicolas Dessaigne at Y Combinator! The next two months are going to be MASSIVE for Multifactor and for agentic security in general 👀

We're building now and moving fast. Come join us on the journey.

The first 250 users to join the waitlist will receive early access to our beta launch.👇

multifactor.com

With YC's help, we’re building the identity security layer the agentic web is missing today.

Multifactor is doing for AI security what
Cloudflare did for web security, Okta did for identity security, and Wiz did for cloud security: defining the category.

So, we're building a secure, user-friendly platform to address this exact problem.

Our product makes sharing account access with anyone, human or AI agent, as simple and secure as sharing a Google Doc.

No passwords exchanged. Just revocable, one-click access.

The core flaw? We’re letting AI agents run our businesses and personal lives by sharing accounts and data insecurely.

For example, a recent attack on Google’s Gemini used a simple calendar invite to control IoT devices, download malware, delete emails, and exfiltrate data.

The agentic era is here, but its foundation is dangerously insecure. The pace of change is incredible, but the risks are growing even faster.

We joined YC because this problem can't wait. We need to move at the speed of the AI revolution, and YC is the ultimate accelerator.

BIG NEWS: Multifactor is joining the Y Combinator Fall 2025 batch to solve the biggest flaw plaguing the AI revolution.

Here’s why this matters 🧵

Addressing the AAA Threat: AuthN, AuthZ, and Auditing for Agentic Applications Multifactor’s platform and technology solves the “AAA threat” and enables new capabilities by allowing agentic applications to have secure access to users’ accounts .

Multifactor’s platform and technology solves the “AAA threat” and enables new capabilities by allowing agentic applications to have secure access to users’ accounts:

multifactor.com/blog/aaa-thr...

Multifactor Receives Zcash Community Grant for Development of MFKDF2 We are are grateful to the Zcash Community for their support of MFKDF2, a secure, user-friendly, next-generation multi-factor key derivation function.

We're honored to share that Multifactor has received a sizeable Zcash Community Grant for our development of MFKDF2! multifactor.com/blog/zcash-g...

Introducing the AAA Threat: Secure Authentication, Authorization, and Auditing for Agentic Applications Enterprises are deploying agentic applications faster than cyber security measures can keep up, leading to major high-profile security incidents exploiting agentic vulnerabilities.

Enterprises are deploying agentic applications faster than cyber security measures can keep up, leading to major high-profile security incidents exploiting agentic vulnerabilities. Learn more about the AAA threats:

multifactor.com/blog/aaa-thr...

Perspectives on Security for AI Agents at Black Hat USA 2025 Multifactor is at Black Hat USA 2025 and DEFCON 33! Are you wrestling with the security implications of Agentic AI? Come chat with us!

Video: Multifactor is at Black Hat USA 2025 and DEFCON 33! Are you wrestling with the security implications of Agentic AI? Come chat with us!

#BHUSA #DEFCON33

multifactor.com/videos/black...

Introducing Switchboard: Provably Secure, Flexible, and Efficient Authorization Colin Roberts, CTO & Co-Founder of Multifactor, demonstrates Switchboard, a secure, flexible, and efficient data authorization management solution that advances the current state of the art by cryptog...

Video: Switchboard offers provably secure, flexible, and efficient cryptographic enforcement of complex data authorization policies

multifactor.com/videos/switc...

Multifactor Wins Hertz Foundation's Harold Newman and David Galas Entrepreneurial Initiative We are honored to receive this recognition, and are grateful to the Hertz Foundation for their belief in our mission to reinvent zero-trust for the modern web.

We’re honored to receive the 2025 #NewmanGalasAward from the #HertzFoundation!

At Multifactor, we’re building new tools to help keep your identity safe online—even in a future shaped by AI and emerging cyber threats. Learn more: multifactor.com/blog/hertz-g...

First Look: Next-Generation Multi-Factor Key Derivation Function (MFKDF2) Colin Roberts, CTO & Co-Founder of Multifactor, provides a first look at the next-generation Multi-Factor Key Derivation Function (MFKDF2), via a live interactive demo.

Colin Roberts provides a conceptual first look at the upcoming next-generation Multi-Factor Key Derivation Function (MFKDF2), planned for release later this year, via a live interactive demo video:

multifactor.com/videos/mfkdf...

Introducing Switchboard: Provably Secure, Flexible, and Efficient Authorization Switchboard is Multifactor's secure, flexible, and efficient data authorization management solution that advances the current state of the art by cryptographically enforcing complex authorization poli...

Introducing Switchboard: Multifactor's secure, flexible, and efficient data authorization management solution that cryptographically enforces complex authorization policies.

multifactor.com/blog/introdu...

Colin Roberts: Why I’m Excited About the Future of Multifactor Colin Roberts, Co-Founder and CTO, shares his journey from pure mathematics to crypto-focused startups and now Multifactor, explaining why he's excited about the future of the company.

Colin Roberts: "The core technologies that we have at Multifactor are finally able to address that 'AAA' threat."

Watch the video: multifactor.com/videos/colin...

Finding Optimal Parameters for KDFs like Argon2, Bcrypt, Scrypt, PBKDF2, Balloon Hashing, & More Colin Roberts, CTO & Co-Founder of Multifactor, demonstrates an interactive tool and free API for selecting optimal parameters for hard KDFs like Argon2, Bcrypt, Scrypt, PBKDF2, and Balloon Hashing.

Colin Roberts, CTO & Co-Founder of Multifactor, demonstrates an interactive tool and free API for selecting optimal parameters for hard KDFs like Argon2, Bcrypt, Scrypt, PBKDF2, and Balloon Hashing: multifactor.com/videos/kdf-p...

Introducing Checkpoint: A Better Way to Share Online Accounts Checkpoint uses novel cryptographic techniques to enable easy revocable, non-repudiable, and fine-grained sharing of any online account resource.

We're building Checkpoint using novel cryptographic techniques to enable easy revocable, non-repudiable, and fine-grained sharing of any online account resource: multifactor.com/blog/introdu...

Colin Roberts: Why I’m Excited About the Future of Multifactor Colin Roberts, Co-Founder and CTO, shares his journey from pure mathematics to crypto-focused startups and now Multifactor, explaining why he's excited about the future of the company.

Colin Roberts, Co-Founder and CTO, shares his journey from pure mathematics to crypto-focused startups and now Multifactor, explaining why he's excited about the future of the company: multifactor.com/blog/colin-r...

How to Choose Parameters for KDFs like Argon2, Bcrypt, Scrypt, PBKDF2, Balloon Hashing, & More (Part 1 of 2) A comprehensive guide and interactive tool for the delicate security decision of selecting the best parameters for hard KDFs like Argon2, Bcrypt, Scrypt, PBKDF2, and Balloon Hashing.

Most cryptographers have faced the challenge of correctly configuring dozens of obscurely-named KDF security parameters. Here's our attempt to solve this problem for you, once and for all: multifactor.com/blog/kdf-par...

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Multifactor, Inc. is now officially a Public Benefit Corporation (PBC). Learn more about our commitment to improving computer security and privacy for all. https://multifactor.com/blog/public-benefit-corporation

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Multifactor has a new look today! Learn more about our redesigned brand identity. https://multifactor.com/blog/2025-multifactor-rebrand

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We're excited to announce that Solid Security is now Multifactor! Learn more about how we got here and what's ahead. https://multifactor.com/blog/solid-security