Geodesic
On the existence of hidden channels
Diskretnaya Matematika, Tome 11 (1999) no. 1, pp. 24-28 
A. A. Grusho. On the existence of hidden channels. Diskretnaya Matematika, Tome 11 (1999) no. 1, pp. 24-28. http://geodesic.mathdoc.fr/item/DM_1999_11_1_a2/
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Voir la notice de l'article provenant de la source Math-Net.Ru

We give conditions under which there exists a communication channel between two subjects, which is invisible to an inspecting subject.This research was supported by the Russian Foundation for Basic Research, grant 97–01–00162.