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-rw-r--r--doc/doxygen/doc_protocol_overview.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/doxygen/doc_protocol_overview.h b/doc/doxygen/doc_protocol_overview.h
index f26ce3a..37de1cb 100644
--- a/doc/doxygen/doc_protocol_overview.h
+++ b/doc/doxygen/doc_protocol_overview.h
@@ -118,6 +118,8 @@
* parts:
*
* - local \c session_id (random 64 bit value to identify TLS session).
+ * (the tls-server side uses a HMAC of the client to create a pseudo
+ * random number for a SYN Cookie like approach)
* - HMAC signature of entire encapsulation header for HMAC firewall
* [only if \c --tls-auth is specified] (usually 16 or 20 bytes).
* - packet-id for replay protection (4 or 8 bytes, includes sequence