对称加密

• Determines the set of valid key sizes for the symmetric cryptographic algorithms
  确定对称加密算法的有效密钥大小设置。
• For more information about symmetric and asymmetric cryptographic keys , see
  有关对称和非对称加密密钥的更多信息，请参见
• For a big bit hash , try using a symmetric cipher adapted to perform hashing
  对于大位数杂凑，尝试使用适合于执行杂凑法的对称加密术。
• Symmetric encryption algorithm must inherit . the following tables list the members exposed by the
  对称加密算法的所有实现必须从其继承的基类。
• To use optimal asymmetric encryption padding oaep when encrypting and decrypting ; otherwise ,
  如果加密和解密时使用最优非对称加密填充( oaep ) ，则为
• Longer hash lengths are likely to require some coding in order to adapt a symmetric cipher
  更长的杂凑长度很可能要求进行一些撰写程式来适应对称加密术。
• Symmetric encryption and decryption is relatively fast , and is suitable for working with large amounts of data
  对称加密和解密速度相对较快，适于处理大量数据。
• Asymmetric encryption is stronger than symmetric encryption using the same key length , but it is relatively slow
  非对称加密比使用相同密钥长度的对称加密更强，但速度相对较慢。
• Asymmetric encryption is therefore not recommended when working with large datasets such as user data in tables
  建议在处理大型数据集（如多个表中的用户数据）时不使用非对称加密。
• The message is encrypted by using a message encryption key with a symmetric encryption algorithm such as triple des
  使用通过对称加密算法（如三重des ）生成的消息加密密钥来加密消息。