Crosslayer Labs Is Building the Immune System for Your Internet Presence

The Macro: The Web’s Security Layers Do Not Talk to Each Other

Internet security has a layering problem. DNS operates in one world. BGP routing operates in another. TLS certificates do their own thing. JavaScript dependencies live in yet another dimension. Each of these layers has its own monitoring tools, its own alert systems, and its own failure modes. But attacks increasingly work by exploiting the gaps between layers. A BGP hijack combined with a fraudulent TLS certificate combined with a DNS redirect creates an impersonation attack that no single-layer monitoring tool would catch.

This is not a theoretical concern. Certificate misissuance attacks, BGP hijacks, and DNS poisoning are well-documented attack vectors that have hit major targets. The existing security tooling market is enormous. CrowdStrike, Palo Alto Networks, and Cloudflare all sell pieces of the monitoring puzzle. But they tend to operate within their own layer. A CDN provider monitors CDN-level threats. An endpoint security tool monitors endpoints. Nobody is correlating signals across DNS, BGP, TLS, and client-side JavaScript simultaneously to identify cross-layer attack patterns.

The companies most exposed are those with large internet footprints in sensitive industries. Healthcare, cryptocurrency, and banking all have web-facing services where impersonation can directly lead to financial loss or data theft. A spoofed login page that perfectly replicates a bank’s website, complete with a valid-looking certificate, is one of the most effective attack vectors that exists.

The Micro: Correlating Signals Across the Entire Stack

Crosslayer Labs was founded by Princeton University security researchers who invented Multi-Perspective Issuance Corroboration, or MPIC. If you have not heard of MPIC, you have still benefited from it. It now secures every single HTTPS connection on the web. That is not a marketing claim. MPIC was adopted by the CA/Browser Forum as a mandatory standard for certificate issuance. These are the people who literally helped build the security infrastructure the internet runs on.

Henry Birge-Lee is the CEO and a pioneer in web and network security. Grace Cimaszewski is the CTO, a PhD candidate at Princeton who worked directly with the CA/Browser Forum on TLS certificate security. Dr. Prateek Mittal, the Chief Scientist, is a Princeton professor whose research has enhanced the security of both HTTPS connections and deployed LLMs. This team has been backed by Y Combinator (W26), AE Investments, and Long Journey VC.

The product provides “outside-in” monitoring of customer infrastructure. Rather than installing agents inside your network, Crosslayer watches your internet presence from the outside, the same way an attacker would see it. They comprehensively discover and monitor all internet dependencies including DNS, BGP, TLS certificates, and JavaScript. Then they correlate signals across these layers to identify attack patterns that single-layer tools miss.

Their alerts include root cause analysis and remediation guidance. This is important because a cross-layer alert without context is just noise. If Crosslayer tells you “your DNS was briefly hijacked and a fraudulent certificate was issued during that window,” that is actionable. If they just say “anomaly detected,” it is not.

The target verticals are healthcare, cryptocurrency, and banking. These are industries where impersonation attacks have the highest ROI for attackers and the most severe consequences for victims. A crypto exchange that gets its domain hijacked can lose millions in minutes. A healthcare provider with a spoofed patient portal faces both financial and regulatory liability.

Competitors in the broader security monitoring space include GreyNoise for threat intelligence, Censys for internet-wide scanning, and the security features built into CDN providers like Cloudflare. But the cross-layer correlation approach is different enough that I do not think Crosslayer is competing head-to-head with any of these. They are filling a gap between existing tools.

The Verdict

The founding team’s credentials are as strong as I have seen in a cybersecurity startup. Building MPIC is not just impressive on a resume. It demonstrates that this team understands internet security at the protocol level, not just the product level.

At 30 days, I would want to see the first enterprise deployments and understand how fast the platform can map a customer’s full internet dependency graph. Speed of onboarding matters in security because customers want protection today, not after a six-week integration.

At 60 days, the question is signal quality. Cross-layer correlation is only useful if the alerts are accurate and low-noise. If security teams start ignoring Crosslayer alerts because they generate too many false positives, the product is dead.

At 90 days, I would be looking at whether they can expand beyond the initial three verticals without diluting their detection accuracy. Each industry has different attack patterns, and the model needs to adapt.

This is the kind of deep-tech security company that either becomes essential infrastructure or stays niche. Given who built it, I am betting on essential.