All the information necessary for decryption is present within the XML encryption tags: the name of the encryption algorithm, the type of data that was encrypted, and the name of the encryption key.
XML加密标记中存在着解密需要的所有信息：加密算法的名称、加密的数据类型以及加密密钥的名称。
Note that XML Encryption is only about encryption and decryption of structured information and does not dictate any particular method of key exchange.
XML 加密只关于加密和解密结构化信息，而不规定密钥交换的任何特定方法。
Both XML standard encryption and WS-Encryption follow a two-step approach for encrypting data.
XML标准加密和WS - Encryption都遵循两步加密数据的方法。
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