Geodesic
Factor structures of transformations
Matematičeskie voprosy kriptografii, Tome 3 (2012) no. 3, pp. 81-104 Cet article a éte moissonné depuis la source Math-Net.Ru

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The existence of nontrivial linear structures is a weakness of cryptographic transformations. We consider factor structures as a generalization of linear structures and describe transformations preserving such factor structures. On the base of the wreath product of transformation semigroups we establish a relationship between the differential attack and the homomorphism attack. 
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B. A. Pogorelov; M. A. Pudovkina. Factor structures of transformations. Matematičeskie voprosy kriptografii, Tome 3 (2012) no. 3, pp. 81-104. http://geodesic.mathdoc.fr/item/MVK_2012_3_3_a4/

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