Geodesic
Lower bounds for the number of keys in Zakrevskij cipher
Zapiski Nauchnykh Seminarov POMI, Combinatorics and graph theory. Part IV, Tome 402 (2012), pp. 40-44 
D. S. Ananichev; D. D. Dublennykh. Lower bounds for the number of keys in Zakrevskij cipher. Zapiski Nauchnykh Seminarov POMI, Combinatorics and graph theory. Part IV, Tome 402 (2012), pp. 40-44. http://geodesic.mathdoc.fr/item/ZNSL_2012_402_a2/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

We present a new lower bound for the number of pairwise non-equivalent invertible Mealy machines with strongly connected underlying digraphs.

[1] G. P. Agibalov, “Konechnye avtomaty v kriptografii”, Prikladnaya diskretnaya matematika, 2009, no. 2, 43–73

[2] A. D. Zakrevskii, “Metod avtomaticheskoi shifratsii soobschenii”, Prikladnaya diskretnaya matematika, 2009, no. 2, 127–137