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胖客户机可以根据内容建立全面分级的安全性策略，而不是无论是否需要都以相同的密钥强度加密所有内容。
Instead of encrypting everything with the same key strength regardless of needs, rich clients can establish a comprehensive differentiating security policy based on the content.
提出一个基于分级身份的密码系统：包括分级的基于身份的加密和签名方案。
A new hierarchical identity based (ID-based) cryptosystem is proposed, including hierarchical ID-based encryption and signature.
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