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Security and Communication Networks
Volume 2017 (2017), Article ID 5746976, 15 pages
Research Article

Digital Implementation of an Improved LTE Stream Cipher Snow-3G Based on Hyperchaotic PRNG

1LISIC Laboratory, Electronics and Computer Science Faculty, University of Science and Technology of Houari Boumediene (USTHB), Algiers, Algeria
2LCOMS, Universite de Lorraine, Metz, France

Correspondence should be addressed to Mahdi Madani

Received 23 June 2017; Revised 10 September 2017; Accepted 27 September 2017; Published 27 November 2017

Academic Editor: Angel M. Del Rey

Copyright © 2017 Mahdi Madani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


SNOW-3G is a stream cipher used by the 3GPP standards as the core part of the confidentiality and integrity algorithms for UMTS and LTE networks. This paper proposes an enhancement of the regular SNOW-3G ciphering algorithm based on HC-PRNG. The proposed cipher scheme is based on hyperchaotic generator which is used as an additional layer to the SNOW-3G architecture to improve the randomness of its output keystream. The objective of this work is to achieve a high security strength of the regular SNOW-3G algorithm while maintaining its standardized properties. The originality of this new scheme is that it provides a good trade-off between good randomness properties, performance, and hardware resources. Numerical simulations, hardware digital implementation, and experimental results using Xilinx FPGA Virtex technology have demonstrated the feasibility and the efficiency of our secure solution while promising technique can be applied to secure the new generation mobile standards. Thorough analysis of statistical randomness is carried out demonstrating the improved statistical randomness properties of the new scheme compared to the standard SNOW-3G, while preserving its resistance against cryptanalytic attacks.