设计了一种密码安全的伪随机比特序列发生器，再将比特序列转化为浮点数序列。
A secure pseudorandom bit sequence generator is designed and the bit sequences are then transformed into floating point Numbers.
提取时对含有水印的视频进行解码，得到量化后的DCT系数，进行LSB提取，RS解码后得到与嵌入序列完全相同的比特序列。
When extracting the watermark, decode the containing video to get the quantized DCT coefficients, get the watermark by using LSB, and RS decoded to get the same sequence as the embedded bit sequence.
利用A5/1算法的密钥和帧序列号初始化弱点，可以用相关分析技术区分出A5/1密钥流与真随机比特序列或恢复A5/1密钥。
The A5/1 key-streams can be easily distinguished from the random sequences, or even the A5/1 keys can be recovered, because of the known weakness of the A5/1 algorithm.
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