Symmetric algorithms have faster performance than asymmetric algorithms, but passing the secret key securely between participants poses a distribution problem.
对称算法的性能比非对称算法的性能快，但是在参与者之间安全地传递秘钥会引起分发问题。
When the algorithms open, the decryption key can not be calculated by encryption key so the encryption key could be open, only keep decryption key secret, that is public key.
当算法公开时，在计算上不可能由加密密钥求解解密密钥，因而可以将加密密钥公开，即公开密钥。
Due to realizing in double-real precision, the algorithms are provided with big secret key space .
而采用双精度实数作为系统初值密钥，其提供的密钥空间巨大。
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