文章把线性复杂度理论检用于密码技术中，设计一种实用的序列随机性检验方法。
Linear complexity theory be applied to cryptographic technology, designing a testing method of a random sequence.
同时检验了收益率序列的随机性，检验结果说明沪深股票市场基本达到弱式有效。
We also verified stochastic feature of return time series, from results we see that Chinese stock market is weak form efficient.
对二值序列做随机性检验和相关性分析的结果表明，该二值序列具有良好的伪随机性和相关性，适合作为加密密钥。
Random testing and correlation analysis were done on binary sequence. The results show that the binary sequence has good pseudo-randomness and correlation, and appropriate to be encryption key.
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