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 Jun20 comment Regarding matsui's Paper on Linear Cryptanalysis of DES Oh yes i get it . It's same as the other equation if you reduce the first two terms Jun20 comment Regarding matsui's Paper on Linear Cryptanalysis of DES While expanding this Equation to a single round of DES, the Output of the function f is XORed with plain text . How does this equation we're talking about hold true because plain text is of random content but Matsui says this equation holds true $X_{2}[7,8,24,29]\bigoplus P_H[7,18,24,29]\bigoplus P_{L}[15]=K_{1}[22]$ Jun20 comment Regarding matsui's Paper on Linear Cryptanalysis of DES Oh My mistake . I's counting bits starting from left handside and was getting a differnt expression,should start counting from right hand side . Spent hours trying to find this .A bucketfull of thanks Jun20 awarded Scholar Jun20 accepted Regarding matsui's Paper on Linear Cryptanalysis of DES Jun20 awarded Editor Jun20 comment Regarding matsui's Paper on Linear Cryptanalysis of DES And please note that it's $NS_{5}(16,15)$ not $NS_{5}(16,5)$ . Typo . I've edited the Question Jun20 revised Regarding matsui's Paper on Linear Cryptanalysis of DES deleted 1 characters in body Jun20 comment Regarding matsui's Paper on Linear Cryptanalysis of DES Exactly . But I'm looking for is how did he manage the 1 round linear approximation from the $NS_{5}(16,15)$ equation . He did not describe that in the paper and nor can i find it anywhere on internet Jun19 awarded Student Jun17 comment Regarding matsui's Paper on Linear Cryptanalysis of DES Please find the paper at www.cs.bgu.ac.il/~crp042/Handouts/Matsui.pdf Jun16 asked Regarding matsui's Paper on Linear Cryptanalysis of DES