Abstract:
We designed and implemented a stream cipher cryptosystem based
on an efficient chaotic generator of finite computing precision (N = 32). The
proposed structure of the chaotic generator is formed by a Key-setup, an IVsetup, a non-volatile memory, an output and an internal state function. The
cryptographic complexity mainly lies in the internal state containing two
recursive filters, with one, two or three delays. Each recursive filter includes a
perturbation technique using a linear feedback shift register. The first recursive
filter includes a discrete skew tent map, and the second one includes a discrete
piecewise linear chaotic map. The chaotic generator is implemented in
sequential and parallel versions using Pthread library in a secure manner. The
proposed Stream ciphers have very good performance in terms of security and
execution time. Experimental results highlight the robustness of the proposed
system against known cryptographic and statistical attacks
