Mathematical methods in solutions of the problems presented at the Third International Students' Olympiad in CryptographyTokareva, N. N.,
Agievich, S. V.,
Idrisova, V.,
Kolomeec, N.,
Kutsenko, A.,
Oblaukhov, A.,
Shushuev, G.,
Gorodilova, A. cryptography are also discussed and
a solution for one of them proposed by
a participant during the Olympiad
On additive differential probabilities of a composition of bitwise XORs. For vectors
a1,...,ak+1 G Zn, it is defined as the probability of transformation input differences
a1,...,ak