A New Stream Cipher Based on Nonlinear Dynamic System
O. Mannai, Rabei Becheikh, Rhouma Rhouma · 2018
In this paper, we introduce a new synchronous stream cipher. The core of the cipher is the Ikeda system which can be seen as a Nonlinear Feedback Shift Register (NLFSR) of length 7 plus one memory. The cipher takes 256-bit key as input and generates in each iteration an output of 16-bits. A single key is allowed to generate up to 264output bits. A security analysis has been carried out and it has been showed that the output sequence produced by the scheme is pseudorandom in the sense that they cannot be distinguished from truly random sequence and resist to well-known stream cipher attacks.