any help appreciated...:)

Hi, i'm trying to solve this problem:

x1 = a1 xor b1 xor c1 xor d1
x2 = a2 xor b2 xor c2 xor d2
x3 = a3 xor b3 xor c3 xor d3
x4 = a4 xor b4 xor c4 xor d4

conditions:
a: a2=a3=a1 xor a4
b: b1=b2=b3 xor b4
c: c1=c4=c2 xor c3
d: d3=d4=d1 xor d2

b,c,d are byte permutations of a

can I make any predicition about a,b,c, or d if I know x?

Thanks in advance
Received on Thu Sep 29 21:42:32 2005