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enter image description hereI would like to understand the linear approximation of $(x+y) \bmod 2^n$ by linear masking method in the paper refereed ""Improved Linear Distinguis'hers for SNOW 2.0" by Kaisa Nyberg and Johan Wall´en." In Page number 14 to 15, one theory has been given. I am unable to understand the $A_r$ matrix computation. Specially what is $v$ in this matrix. Advance thanks for anyone's kind explanation.

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    $\begingroup$ please use mathjax and provide proper mathematical details $\endgroup$ – kodlu May 2 '20 at 23:47

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