An algebraic attack on the improved summation generator with 2-bit memory.

Daewan Han Moonsik Lee An algebraic attack on the improved summation generator with 2-bit memory. 43-46 2005 93 Inf. Process. Lett. 1 http://dx.doi.org/10.1016/j.ipl.2004.08.012 db/journals/ipl/ipl93.html#HanL05