Geodesic
Hidden channels and information security in computer systems
Diskretnaya Matematika, Tome 10 (1998) no. 1, pp. 3-9 
A. A. Grusho. Hidden channels and information security in computer systems. Diskretnaya Matematika, Tome 10 (1998) no. 1, pp. 3-9. http://geodesic.mathdoc.fr/item/DM_1998_10_1_a0/
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     author = {A. A. Grusho},
     title = {Hidden channels and information security in computer systems},
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     volume = {10},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1998_10_1_a0/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

While constructing information security systems, one should allow for existence of the so-called Troyan horses and other hidden holes to attack. In this paper, we model such a situation on the base of a pair of automata, legal and illegal. which are controlled by a common input. We give a definition of a subliminal illegal control channel. Existence conditions and examples of subliminal channels are given.This research was supported by the Russian Foundation for Basic Research, grant 97–01–00162.