Shepherd, Simon J.Mex-Pereira, Jorge C.2009-10-262009-10-262002Mex-Pereira, J.C. and Shepherd, S.J. (2002). Cryptanalysis of a summation generator with 2 bits of memory. Signal Processing. Vol. 82, No. 12, pp. 2025-2028.http://hdl.handle.net/10454/3744NoThe conventional summation generator (SG) has been broken in the past using a number of different methods. Recently, a modified SG was proposed by Lee and Moon to increase the resistance of such generators against these attacks. However, this paper shows that even the modified generator is still vulnerable to correlation attacks.enCryptanalysisCorrelation attackKeystream generatorArticlehttps://doi.org/10.1016/S0165-1684(02)00356-0