Analysis and Design of Non Linear Snow 2.0 for Improved Security

In this paper, the authors propose a stream cipher; non-linear snow 2.0 by embedding non-linear function in dynamic feedback based modified snow 2.0 along with analysis of Guess and Determine (GD) Attack. The proposed non linear snow 2.0 uses two Linear Feedback Shift Registers (LFSR) in addition to the non-linear function to make the static nature of modified snow 2.0 dynamic. In non-linear snow 2.0, the feed back change accepts values at dynamic tap positions rather than static so its structure is considered as dynamic and non-linear.