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Summation generator can be easily made as a simple hardware or software and it`s period and linear complexity are very high. So it is appropriate to mobile security system for ubiquitous environment. But it showed us the weakness by Golic`s correlation attack and Meier`s fast correlation attack. In this paper, we proposed a Nonlinear Summation Generator(NSG), which is improved by using LFSR and NFSR(nonlinear feedback shift register), is different from algorithm which use only LFSR in summation generator. It enhanced nonlinearity and is hard to decipher even though the correlation attack or fast correlation attack. We also analyzed the security aspects and the performances for the proposed algorithm.

NSG : A Security Enhancement of the E0Cipher Using Nonlinear Algorithm in Bluetooth System

NSG : A Security Enhancement of the E₀Cipher Using Nonlinear Algorithm in Bluetooth System