A forgery attack is presented on the self-certified signature scheme.
本文对一种自证明签名方案实施了伪造攻击。
A certified copy comes with a raised seal, will have the signature of the concerned authority and will be on a security paper.
一个经过鉴定的副本上盖有钢印，有相关权威的签字并且印刷在防伪纸张上。
The actual meaning of the digital signature should be understood as: "a person who claims to have such and such E-mail address certified this file, and it hasn't changed since then."
数字签名的实际意义应该被理解为：“声称有某某电子邮件地址的人证明了他有这个文件，并且此后此文件未被更改过。”
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