The uri indicates the location of the encrypted key and the transform chain that can contain xpath transforms , decompression transforms , or information on how to retrieve the encrypted data from a document storage facility 类的新实例。此uri指示已加密密钥的位置和可以包含xpath转换和解压缩转换的转换链,或有关如何从文档存储设备中检索已加密数据的信息。
The four secure key management mechanisms , including kp ( protect key ) , kd & ke ( decrypt & encrypt key ) , kw ( working key ) and km ( message key ) , which can protect the key " end - to - end " and ensure the key only use once 采用了保护密钥尤尸、双钥密钥(犬d进犬e ) 、工作密钥kw和消息密钥尤材等四级密钥管理体制。该体制可以保证密钥的端端性和一次一密性。