Generating dataset for LFSR stream cipher I have implemeneted the code for cryptanalysis of LFSR stream cipher . But I have a problem with generation of dataset i.e to get valid  pairs using LFSR stream cipher. In the stinson book it is mentioned that if coefficients $$(c0,c1,\dots,cm-1)$$ are chosen in suitable way and if non-zero $$k=(k1,\dots,km)$$ is chosen then we will get a periodic stream cipher with period $2^{m-1}$. 

What should be the values of $$c0,c1,\dots,cm-1$$ that I should choose?
Firstly using an LFSR output as a keystream generator is insecure, due to the Berlekamp-Massey attack which only needs $2m$ bits of known or guessed plaintext to break the stream with period $2^m-1.$

The coefficients  you are asking about, must define a polynomial $$c(x)=c_0+c_1 x +c_{m-1} x^{m-1}+x^m$$ with $c_0=1,$ and $c(x)$ must be primitive. See Wikipedia here.