When a generator is scrambled at the output only, its period is normally the same as the original linear recurrence (not scrambled). The following papers (and the references given there) discuss the period length of these linear generators, modulo 2 and modulo m > 2:
I have read "Scrambled Linear Pseudorandom Number Generators", but I could not understand logically how to find the parameter of the full period.
Can anyone help me understand it?
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Xoroshiro uses an F_2-linear recurrence, so the theory and methods in the first paper apply. For more specific discussions, see the xoroshiro paper by Blackman and Vigna, in ACM Trans. on Math Software, http://arxiv.org/abs/1805.01407
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