From e6850401559893cfa3a76d8949ed61b011c77da9 Mon Sep 17 00:00:00 2001
From: Gab <24553253+gabrix73@users.noreply.github.com>
Date: Fri, 28 Aug 2026 01:34:16 +0200
Subject: Document ephemeral Composer and asynchronous delivery

---
 docs/FOG-SX.md | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'docs/FOG-SX.md')

diff --git a/docs/FOG-SX.md b/docs/FOG-SX.md
index 336acae..67383ee 100644
--- a/docs/FOG-SX.md
+++ b/docs/FOG-SX.md
@@ -764,6 +764,18 @@ The high-assurance construction requires:
 - schematics, bill of materials, board photographs, continuity tests, optical
   direction tests, and teardown evidence for the exact hardware revision.
 
+FOG does not assume that a PC provides a native TOSLINK port. The intended
+high-assurance profile uses dedicated offline `TOTX` and online `TORX` boards
+with narrowly allowlisted local interfaces. A consumer optical audio port or
+adapter may support a functional experiment but does not establish physical
+directionality.
+
+The optical diode constrains data flow through the selected fiber only. It
+cannot stop a compromised offline Composer from placing plaintext, keys, or a
+covert signal into the permitted offline-to-online output, and it cannot
+protect unlocked Composer state from compromised local firmware, drivers,
+peripherals, or host software.
+
 TOSLINK defines optical transmitter and receiver device classes, not the
 complete FOG-SX modulation. Before activation the candidate must fix the exact
 NRZ or self-clocking line code, bitrate, transition density, preamble, clock
-- 
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