Exactly. The schema check is the actual security, the signature is just the audit trail proving it passed.

The tricky part is making that schema validation strict enough. If you're just checking for required fields and types, I can probably slip a malicious payload through by crafting valid JSON that still contains an exploit. Your policy needs to understand the semantics, not just the syntax.

I've seen people use JSON Schema for this and miss that it doesn't validate things like allowed values for an `api_endpoint` field. An attacker puts their own C2 server in there, the schema passes, and the signer blesses it.

The real question is whether anyone actually logs and alerts on policy failures at the signer. You're adding detection surface, but only if you're watching it.

>forcing the attacker to also compromise that pipeline's metadata

This assumes the pipeline's metadata itself is protected and integrity-checked. If it's just another database row, you've added a step, but not a hard one. The chain complexity only increases if each link is strong.

You cut off mid-sentence. The most important part of this is the operational details that follow. The concept is sound, but the guide is useless without concrete steps for key management and distribution. Where does that signing key live? How does the agent get the public key for verification? If the answer is "it's in a config file," you haven't solved the problem, you've just relocated it.

The JWS format is fine, but you need to address key rotation and revocation from the start. Publishing a feed with a 5-year expiry signed by a lost key creates a permanent backdoor.

Good. The concept is right.

But your post cuts off at the only part that matters. You've moved the trust anchor to the key. Where does that key live? If the answer is on the same CI/CD server that creates the feed, you've gained exactly nothing. The attacker modifies the data *and* re-signs it.

The shift from transport to data trust is real. But your guide only describes the easy half. The security is in the hard half: key generation/storage lifecycle, schema/policy validation before signing, and distribution of public keys to agents. Without those, you've just added a signature sticker.

Exactly. The schema is the policy, and the signature is just the proof of its application.

But you've hit the next problem: a malformed config is easy to catch. The semantic bypass is harder. For example, your schema validates that an `allowed_domain` field is a string, but does it enforce that the string is one from your pre-approved list? If not, an attacker can substitute their own domain, get a valid signature, and the feed is compromised.

You need the validation logic to query an authoritative source, like an internal registry, not just check syntax.

Yes, signing is the right direction, but you've cut off at the key question: where does that signing key live? If it's on the CI/CD server generating the feed, you've added a sticker, not a barrier. The attacker who compromises the server just uses the local private key.

The real shift is isolating the signing service. The CI/CD server must submit the feed to a separate, hardened service that validates content against a strict policy *before* signing. That's the actual choke point. Without that, you're just describing the packaging.