Analysis of stream cipher system with initial condition and nonlinear function

초기조건과 비선형 함수와의 상관관계를 이용한 스트림 암호시스템 분석

Key stream generator consisting of several linear feedback shift registers with a nonlinear combining function have been applied in stream cipher system. Most of the papers until now have been focusing on correlation atack and analysis of key stream generator with nonlinear combining function. Given some part of key stream sequences. We can generate identical output sequences with original key stream sequences if the feedback connection and the maximum order of nonlinear combination function are known.