Key-Dependent Feedback Configuration Matrix of Primitive <i>σ</i>–LFSR and Resistance to Some Known Plaintext Attacks

In this paper, we propose and evaluate a method for generating key-dependent feedback configurations (KDFC) $\sigma $ -LFSRs. -LFSRs with such can be applied to any stream cipher that uses word-based LFSR. Here, configuration generation algorithm the secret key(K) Initialization Vector (IV) generate new after initialization round. It replaces older known configuration. The keystream is generated from FSM part. We have mathematically analysed by method. As test case, on SNOW 2.0 studied its impact resistance algebraic attacks. Besides, as consequence of resisting attacks, also withstand some other attacks like Distinguishing Attack, Fast Correlation Guess Determining Attack Cache Timing Attack. Further, tested randomness briefly described implementation challenges involved in same.