In this scheme, the key updating algorithm is used by the original signer, so the security of the proxy signature key is promoted to a higher level.
该方案将密钥更新算法应用在原始签名者计算过程中，更有效增强了代理签名密钥的安全性。
The security request of security multicast is different, including identity authentication, data authentication, data integrality, key updating etc.
安全多播系统对安全的需求比较复杂，包括身份认证、数据认证、数据完整性、密钥更新等多方面需求。
This can be useful if you want to explicitly add a new key without updating it if it already exists.
如果您想要显式地添加一个新键而又不会因它已经存在而更新它，那么这个函数将十分有用。
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