它包括涉及签名语法、资料模型、格式、密码处理方面的要求，以及外部要求和协调。
It includes requirements as they relate to the signature syntax, data model, format, cryptographic processing, and external requirements and coordination.
本文在分析目前密码管理协议的基础上，针对DSPS系统的需求和特点设计并实现一种密钥管理协议。
Basing on the analysis of the popular key management protocols, we design and implement a novel key management protocol aiming at the requirements of DSPS system.
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