Abstract
At Indocrypt’2002, a new pseudorandom generator based on linear feedback shift register (LFSR) and feedback with carry shift registers (FCSR) was proposed by Arnault. And at Indocrypt’2004, Bin Zhang et al. showed that the self-synchronizing stream cipher constructed by Arnault’s pseudorandom generator was extremely weak against a chosen ciphertext attack. In this paper, we show that the synchronizing stream cipher constructed by Arnault’s pseudorandom generator bear good immunities to the attack proposed by Bin Zhang et al., but can not resist the LFSRization attack proposed by Martin Hell and Thomas Johansson. Then we propose a modification to the synchronizing stream cipher, and show that it inherits of the nice statistical properties of the pseudorandom generator and provided a resistant to the known attacks. The new architecture still has high throughput and low implementation cost.
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