On the closeness of distribution of some random variable to the equiprobable one
Matematičeskie voprosy kriptografii, Tome 14 (2023) no. 1, pp. 5-14
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Let $b \geqslant 2$ and $N$ be natural numbers, $X_0,X_1,\ldots ,X_{n-1}$ be nonhomogeneous sequence of independent random variables taking values $0, 1,\ldots , b-1$, $$Y_{n}=X_{0}+bX_{1}+\ldots+X_{n-2}b^{n-2}+X_{n-1}b^{n-1}$$ and $$Z_{n}=Y_{n}\text{ mod }N.$$ We estimate the closeness of distribution of random variable $Z_n$ to the uniform distribution on $\{0,1,\ldots,N-1\}$ in the case when $b$ and $N$ are mutually prime.
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