eng
episciences.org
Discrete Mathematics & Theoretical Computer Science
1365-8050
2011-01-01
DMTCS Proceedings vol. AP,...
Proceedings
10.46298/dmtcs.2970
2970
journal article
NOCAS : A Nonlinear Cellular Automata Based Stream Cipher
Sandip Karmakar
Dipanwita Roy Chowdhury
LFSR and NFSR are the basic building blocks in almost all the state of the art stream ciphers like Trivium and Grain-128. However, a number of attacks are mounted on these type of ciphers. Cellular Automata (CA) has recently been chosen as a suitable structure for crypto-primitives. In this work, a stream cipher is presented based on hybrid CA. The stream cipher takes 128 bit key and 128 bit initialization vector (IV) as input. It is designed to produce $\mathrm{2^{128}}$ random keystream bits and initialization phase is made faster 4 times than that of Grain-128. We also analyze the cryptographic strength of this cipher. Finally, the proposed cipher is shown to be resistant against known existing attacks.
https://dmtcs.episciences.org/2970/pdf
Cellular Automata
Stream Cipher
NMix
Hybrid Nonlinear Cellular Automata
[INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]
[MATH.MATH-DS] Mathematics [math]/Dynamical Systems [math.DS]
[NLIN.NLIN-CG] Nonlinear Sciences [physics]/Cellular Automata and Lattice Gases [nlin.CG]
[MATH.MATH-CO] Mathematics [math]/Combinatorics [math.CO]