The compliance and vendor decks are full of "cryptographically assured audit trails" and "tamper-proof logs." Meanwhile, I'm over here manually dumping every PCR quote, node attestation doc, and sealed blob manifest into a cold storage directory. It's a graveyard of JSON files.
What's the actual threat model here? The vendor says the logs are "secure." But if the enclave runtime itself is compromised, are those logs part of the trusted computing base? I'm documenting everything externally because I don't trust the internal state. Feels like I'm building a paper trail for a disaster I won't be able to fully autopsy anyway.
Oh, I feel this in my soul. That directory of JSON files is a monument to the gap between the vendor slide and the reality on the ground.
You're absolutely right to question the threat model. If the runtime is the point of failure, its own logs become suspect. You're externalizing the evidence because the system can't vouch for itself after a breach. The cold storage dump is your real "root of trust" at that point.
Have you looked at any of the transparency log patterns, like a Witness or Rekor? They're built for this externalized, append-only proof. It's still more infrastructure, but it moves the problem to a service you might (maybe) trust a bit more. Still feels like building a lighthouse for a ship that's already sunk, though.
Yeah, the "lighthouse for a ship that's already sunk" analogy hits hard. It's comforting to have that external dump, but the panic starts when I actually try to picture using it. Like, if the runtime is truly gone, am I even equipped to parse and correlate all those JSON files under pressure? Or is it just a digital panic room I'll never figure out how to open?
I've seen Rekor mentioned a lot, but that just feels like moving the trust problem. Now I have to trust the transparency log service, manage keys for it, and keep it online. It's another system that could fail or get compromised. Isn't that just adding another potential point of failure to my already shaky chain?
So what's better, a simple manual dump you control, or a complex external system you have to integrate and trust? Neither feels great. Is there a middle ground that doesn't require a whole new service?
You've pinpointed the core dilemma. The manual JSON dump fails the "panic test" - when the system is melting, you won't have time for manual correlation. But you're also correct that a service like Rekor simply relocates the trust. It's a trade of one complex dependency for another.
There is a middle ground, but it requires shifting the goal from *archival* to *verification at generation time*. Instead of just storing raw JSON, you write a small, purpose-built verifier daemon that runs on a separate, minimally-trusted host. Its job isn't to log, but to *validate and countersign* each attestation as it arrives. It checks PCR ranges, certificate chains, and nonces, then outputs a single, consolidated signed receipt. That receipt is your audit trail. You still keep the JSON blobs, but the actionable forensic artifact is the receipt.
Now your panic-scenario task is verifying a single signature from a key you isolated, not parsing a thousand JSON files. The daemon can be simple enough to formally verify or write in a memory-safe language, reducing its own attack surface. It doesn't need to be highly available, just intact. You're not adding a new online service, you're adding an offline verifier with a known, small TCB.
The real problem is that most teams lack the low-level TPM and attestation expertise to write that verifier. So we're back to square one: trusting a vendor's black box or building our own.