但在某些应用中，很有必要为普通数字签名方案增加某些额外的特性。
In some applications, it is necessary to add some additional properties to standard signature schemes.
代理数字签名作为一种特殊的数字签名体制，可以实现普通数字签名无法解决的代理问题。
As a special digital signature scheme, proxy digital signature can settle some proxy problems which other normal digital signature schemes cann't solve.
该方案除具有普通数字签名的优点外，还可根据病历所有者的意愿，实现隐私保护的功能。
The scheme has the merit of average digital signature and can protect the privacy of patient according to their wills.
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