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In the imaginary dream world that Adobe, Google et al live in, the final file does indeed have a signature. Each piece of software in the chain must use TPM-li
by Retr0id 2mo ago
In the imaginary dream world that Adobe, Google et al live in, the final file does indeed have a signature.
Each piece of software in the chain must use TPM-like technologies (yes, even GIMP) to make sure it's running a "legitimate" build of the software, on "legitimate" hardware, and re-sign the file at each step along the way (using keys provisioned during some flavour of remote attestation flow, or using a RA-authenticated remote-signing oracle).
The final file embeds every preceding manifest, so you can "verify" all the way back to the original.
If this all sounds patently unworkable, that's because it is.