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Let K be a finite commutative ring and f = f (n) a bijective polynomial map f (n) of the Cartesian power K n onto itself of a small degree c and of a large order. Let f y be a multiple composition of f with itself in the group of all polynomial automorphisms, of free module K n . The discrete logarithm problem with the "pseudorandom" base f (n) (solve f y = b for y) is a hard task if n is "sufficiently large". We will use families of algebraic graphs defined over K and corresponding dynamicaldoi:10.2478/v10065-012-0030-2 fatcat:uxqalhfbvfao7kgvuwht4dpjye