Decryptor understands XPath expressions in order to identify the XML element for decryption.
为了识别需要解密的xml元素，Decryptor要能理解XPath表达式。
Step 4: Create the Decryptor object with decryption key and the location of the encrypted data that is to be decrypted.
步骤4：用解密密钥和需要解密的加密数据所在的位置创建Decryptor对象。
Step 4: Create the Decryptor object with decryption key and the location of the encrypted data that is to be decrypted.
步骤4：用解密密钥和需要解密的加密数据所在的位置创建Decryptor对象。
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