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**2001/052**

**Title:**

Differential Probability of Modular Addition with a Constant Operand

**Authors:**
Alexis Warner Machado

**Abstract:**

In this article I analyze the function f(X) = A + X (mod 2**n) exclusive-or differential probability. The result, regarding differential cryptanalysis, is a better understanding of ciphers that use f(X) as a primitive operation. A simple O(n) algorithm to compute the probability is given.

**ePrint:**
https://eprint.iacr.org/2001/052

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