The application of σ-LFSR in Key-Dependent Feedback Configuration for Word-Oriented Stream Ciphers [article]

Subrata Nandi, Srinivasan Krishnaswamy, Behrouz Zolfaghari, Pinaki Mitra
2021 arXiv   pre-print
In this paper, we propose and evaluate a method for generating key-dependent feedback configurations (KDFC) for σ-LFSRs. σ-LFSRs with such configurations can be applied to any stream cipher that uses a word-based LFSR. Here, a configuration generation algorithm uses the secret key(K) and the initialization vector (IV) to generate a feedback configuration. We have mathematically analysed the feedback configurations generated by this method. As a test case, we have applied this method on SNOW 2.0
more » ... and have studied its impact on resistance to various attacks. Further, we have also tested the generated keystream for randomness and have briefly described its implementation and the challenges involved in the same.
arXiv:2003.09381v2 fatcat:gad22zfc6jfuhadk7a7rhmgcey