新版美国护照采用了第一流的标准，其内置的附加功能使得伪造它特别难。
The new American passport sets the gold standard. It has additional features built into it that make it especially hard to counterfeit.
该文针对目前代理签名中普遍存在的代理权撤销难、原始签名人伪造和代理权滥用等问题，提出一个新的可收回代理权的代理盲签名方案。
According to the problems of proxy revocation, original signer's forgery and proxy misuse in proxy signature, a secure proxy blind signature scheme with proxy revocation is proposed.
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