A forgery attack is presented on the self-certifiedsignature scheme.
本文对一种自证明签名方案实施了伪造攻击。
2
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。
3
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."