## On D(n; q) quotients of large girth and hidden homomorphism based cryptographic protocols

### Vasyl Ustimenko, Michał Klisowski

DOI: http://dx.doi.org/10.15439/2022F54

Citation: Communication Papers of the 17th Conference on Computer Science and Intelligence Systems, M. Ganzha, L. Maciaszek, M. Paprzycki, D. Ślęzak (eds). ACSIS, Vol. 32, pages 199–206 (2022)

Abstract. Noncommutative cryptography is based on applications of algebraic structures like noncommutative groups,semigroups, and noncommutative rings. Its intersection withMultivariate cryptography contains studies of cryptographicapplications of subsemigroups and subgroups of affine Cremona semigroups defined over finite commutative rings. Efficientlycomputed homomorphisms between stable subsemigroups of affine Cremona semigroups can be used in tame homomorphisms protocols schemes and their inverse versions. The implementationscheme with the sequence of subgroups of affine Cremona group that defines the projective limit was already suggested. We present the implementation of another scheme that uses two projective limits which define two different infinite groups and the homomorphism between them. The security of the corresponding algorithm is based on complexity of the decomposition problem for an element of affine Cremona semigroup into a product of given generators. These algorithms may be used in postquantum technologies.

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