中文摘要：

非合作通信条件下，针对扰码器初始参数估计问题，第三方需在通信参数不完全所知的情况下，对抗干扰、重建反馈多项式和估计初始状态，以重建扰码器。首先，根据对偶码特性和多信息流抗干扰技术，构造具有低误码率特性并包含扰码器特征参数的新序列；其次，采用低重量倍式搜索算法和基于对偶码的快速相关攻击算法，分别对新构造序列的反馈多项式和初始状态进行估计；最后，根据新序列与扰码的关系，重建扰码器初始参数。仿真结果表明，算法可在信噪比为0dB条件下有效对抗噪声干扰并重建扰码器。

英文摘要：

In the non-cooperation communication, an eavesdropper didn＇ t have all parameters. In order to estimate the ini- tial parameters of scrambler, we had to correct the transmission errors and to recover the feedback polynomial and initial state of scrambler. With the property of dual word and technique of multiple streams anti-interference, we generated a new sequence of low-error probability that contained the parameters of scrambler. According to low-weight multiple searching al- gorithm and fast correlation attacks based on convolutional code, we reconstructed the feedback polynomial and initial state of the new generated sequence. Finally, we recovered the initial parameters of scrambler by the relationship between the new sequence and scrambling sequence. The simulation results verify the efficiency of the reconstruction method that can eliminate the noise interference effectively when the signal-to-noise ratio is 0 dB.