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I'm reading a paper here say:

As we know, in hybrid PKE schemes XOR alone cannot perfectly hide challenge bit to the CCA2 adversary

  1. The author does not define hybrid PKE schemes. What is their definition?

  2. Why is it that XOR alone cannot perfectly hide challenge bit to the CCA2 adversary in hybrid PKE schemes?

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1. en.wikipedia.org/wiki/Hybrid_cryptosystem $\;$ –  Ricky Demer Nov 20 '13 at 2:21
1  
Unless you have a good reason, I wouldn't worry too much about that paper. Why not read something else, like Bernstein, Lange and Peters (cr.yp.to/codes/mceliece-20080807.pdf) and its references? –  K.G. Nov 20 '13 at 8:29
    
@K.G Why wouldn't worry too much about that paper? –  juaninf Nov 20 '13 at 14:03
    
You learn more by reading better papers. –  K.G. Nov 21 '13 at 7:48

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