subliminal channel
süvakanal
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https://en.wikipedia.org/wiki/Subliminal_channel
https://cs.gmu.edu/~zduric/cs803/Simmons.pdf
https://www.emsec.rub.de/media/crypto/attachments/files/2011/03/subliminal_channels.pdf
https://www.sciencedirect.com/science/article/pii/S089812211000012X
https://www.freehaven.net/anonbib/cache/ringstwice07.pdf