If I have a byte A, B, C, Eand F, and I perform the operation (eg, XORing) A^B = E, A^C = F, how can I perform an operation on Fand Eto return char A? This is a common factor between the two operations.
A
B
C
E
F
A^B = E
A^C = F
It's impossible.
A simple example of a counter is the case when A = B = C. Then E and F are both 0, so they do not contain any information for restoring A.
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