5.1 In the discussion of MixColumns and Inverse MixColumns, it was stated that
b(x) = a1(x) mod (x4+ 1) where a(x) = {03}x3+ {01}x2+ {01}x + {02} and b(x) = {03}x3+ {0D}x2
+ {09}x + {0E}. Show that this is true.
 
 
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