C04-RT: Yes
Rationale
In the already selected secret-IFAC serial profile, preprocess_inbound rejects missing or invalid access codes before packet parsing. The base interface violation handler only counts/logs locally. This supplies a secret-gated defense against eliciting protocol replies, not universal camouflage or constant-time processing.
Assessment method
Documentary analysis
Source context
Primary specification / explicit profile inference
Outstanding qualification
Capture invalid, missing, replayed and guessed IFAC probes on the selected serial interface; inspect driver responses and timing. Tag length, secret quality and replay handling limit the defense. No active probing performed.