Title: Software Stream Cipher based on pGSSG Generator

Issue Number: Vol. 3, No. 2
Year of Publication: Jun - 2014
Page Numbers: 111-121
Authors: Antoniya Tasheva , Zhaneta Tasheva and Ognyan Nakov
Journal Name: International Journal of Cyber-Security and Digital Forensics (IJCSDF)
- Hong Kong
DOI:  http://dx.doi.org/10.17781/P001301


Secrecy of a software stream cipher based on p-ary Generalized Self-Shrinking Generator (pGSSG) is examined in this paper. Background information for the generator’s algorithm is provided. The software architecture and key management for the cipher initialization are explained. Galois Field GF(25732) and feedback polynomials are chosen for initialization of the generator. In order to examine the secrecy mathematical model of the software system is made. It is proved that the cipher is not perfect but the empirical tests result in less than 0,0125% deviation of the encrypted files’ entropy from the perfect secrecy. At last the proposed cipher is compared to four eSTREAM finalists by key length and period.