(original) (raw)
B's goal is to convert the vector to the vector of all zeros. A's goal is to prevent this from ever happening. There is a series of rounds for _t_=0, 1, ... In the _t_th round:
B picks an n-bit pattern P.
A circularly shifts P by any amount she wants, then xors the result with the current vector_Vt_ producing_Vt+1_.