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Crosslayer Labs

Attack surface monitoring for web infrastructure

  • Cybersecurity
  • Infrastructure
  • Analytics
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About

Crosslayer Labs protects companies against hijacks of their websites and APIs. It maps everything a company exposes across its own and third-party services, watches every layer of the network stack for signs of attack, and correlates those signals so a hijack is caught and stopped quickly.

The founders come from Prateek Mittal's network security lab at Princeton, where Henry Birge-Lee and Grace Cimaszewski's research produced Multi-Perspective Issuance Corroboration, which now secures the issuance of every HTTPS certificate. They started the company in 2025 and went through Y Combinator's Winter 2026 batch.

Record

Stage
Seed
Category
Cybersecurity
Location
New York City, NY
Team
1-10
Total raised
$500K

Founders

  • Henry Birge-Lee

    Founder/CEO

    Invented Multi-Perspective Issuance Corroboration, which now secures every HTTPS certificate, as a researcher at Princeton, and founded the Open MPIC project.

  • Grace Cimaszewski

    Founder/CTO

    A recent Princeton PhD whose research on TLS certificate security became ecosystem-wide requirements through the CA/Browser Forum, after visiting research roles at Google and Corelight Labs.

  • Prateek Mittal

    Founder & Chief Scientist

    Professor of electrical and computer engineering at Princeton, specializing in security and privacy, and a recipient of the ACM Grace Hopper Award.