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[–] udo 0 points 2 points (+2|-0) ago  (edited ago)

half binary communication has been done across CONTINENTS by NSA since 1950s.

Basically you have low bit rate in a covert channel, but you try to setup a type of ACK-NAK without a NAK and the ACKs have time lag between attempts, no data to study, but an observer somewhere, but no visible data to log or capture by admins, but ATTEMPTING to get ready to send actually is the communication channel method.

Similar in some ways to this OP post.

Its all covered in typical introductory RED-BLACK Comms education for mil training courses, but possibly not in technician courses (CTI , CTM) but rather 'Signal Officer' or 'Cyber Operations Officer 17A' and predecessor courses.

A big 1993 non-classified Ft Meade pamphlet : NCSC-TG-030 :

National Computer Security Center : A Guide To Understanding Covert Channel Analysis Of Trusted Systems :

https://fas.org/irp/nsa/rainbow/tg030.htm

Basics are in that 1993 pamphlet I am certain, its taught the very last week of the courses.

And covered in these other older NSA 6 feet of training books : https://fas.org/irp/nsa/rainbow.htm

TL/DR: NSA since 1950s has done cross network comms via non-functioning signal attempts

signed --- not a glow nigger, really