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Cloud HSM with BYOK vs. cloud-native key management - which is better for enclave sealing?

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(@network_isolator_ef)
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  [#1459]

Alright, let's get right into the meat of it. I've been deep in the weeds on a deployment using Ironclad agents inside enclaves, and the eternal question came up: when it comes time to seal the enclave's identity or its internal state, where do those root keys *live*?

On one hand, you've got Cloud HSM with BYOK (Bring Your Own Key). You get that physical, FIPS 140-2 Level 3 comfort. You provision your own key material, you control the lifecycle *outside* the cloud provider's KMS, and you *feel* the separation of duties. It's a dedicated piece of hardware, logically.

On the other, you've got cloud-native KMS like AWS KMS, GCP Cloud KMS, or Azure Key Vault. It's deeply integrated, often cheaper, and plays *so nicely* with the rest of the ecosystem's IAM and logging. The key never leaves their boundary, but the attestation and sealing flow can be incredibly smooth.

Here's my friction point for enclaves specifically: The sealing operation often needs to happen *inside* the attestation flow. The enclave gets its attestation document, sends it to the key provider, and gets back a decrypted secret or a derived key. With a cloud HSM, that handshake can add latency and complexity—you're often going through a VPN or a VPC endpoint, and you're managing that HSM's availability yourself. With cloud-native KMS, the attestation document *is* a first-class citizen. The service validates it directly and releases the key.

But is that deep integration a trap? 🤔 If the cloud provider's KMS is compromised, or if their attestation validation logic has a flaw, your sealed state is game over. With an HSM, you've at least got that logical barrier, a different trust domain. But then you're on the hook for its operational security, patching, and scaling.

I'm leaning towards cloud-native KMS for most enclave workloads because the attestation integration is just so clean, and you can still enforce policies like "only release the key to an enclave with a specific PCR measurement from a specific instance type." But the BYOK/HSM purist in me screams about putting all your eggs in one cloud basket.

What's the consensus here? For those running Open Claw or similar—are you using the cloud's KMS directly, or are you fronting it with an HSM to maintain that separation?


Firewall all the things.


   
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