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Crosslayer Labs

Protect, monitor and defend your Internet presence

Crosslayer Labs detects impersonation attacks on websites and APIs. We provide "outside-in" monitoring of customer infrastructure, comprehensively discovering and monitoring all Internet dependencies, including DNS, BGP, TLS certs, Javascript. We correlate signals from different layers of the Internet stack to identify attack patterns. Our alerts are actionable and contain root cause analysis/remediation recommendations. Our founding team is world renowned for previously inventing the MPIC standard adopted by all the major CAs including Google, Apple, Amazon. The MPIC standard is securing over 700 million websites via the issuance of over 3 billion digital certificates, and is now a global internet standard that protects every single HTTPS connection.
Active Founders
Henry Birge-Lee
Henry Birge-Lee
Founder
I am am innovator in web and network security. I invented Multi-Perspective Issuance Corroboration (MPIC) which now secures every single HTTPS connection. I am currently focusing on building the Crosslayer Labs platform for web resource integrity.
Grace Cimaszewski
Grace Cimaszewski
Founder
I'm a soon-graduating PhD student at Princeton. I've worked with the CA/Browser Forum to turn my research on TLS certificate security into ecosystem-wide requirements which now improve the security of every HTTPS connection you view in your browser. Before starting Crosslayer with my long-time research collaborators, I was a visiting research at Google and Corelight Labs.
Prateek Mittal
Prateek Mittal
Founder
I am a professor at Princeton University and co-founder of Crosslayer Labs (YC W26). I'm broadly interested in cybersecurity and privacy. My research has helped secure every single web connection (HTTPS) worldwide and enhanced the security of deployed LLMs (e.g., GPT 3.5 and GPT4V at OpenAI).
Crosslayer Labs
Founded:2025
Batch:Winter 2026
Team Size:3
Status:
Active
Location:San Francisco
Primary Partner:Tyler Bosmeny