While inserting, we use the last bit of each byte to compose the sampling sequence whose length is the number of primary samples subtracts 256. Then we use MD5 to compute the sampling sequence and get the index value, which is 256 bits.

• 该算法嵌入水印时抽取原音频采样的（S-256）个字节最后一位的数据，组成采样值序列。 使用MD5算法对上述采样值序列做运算，生成256位的索引值。