1·The certificateless signature scheme can suffer from public key replacement attack so that any one can forge a valid signature on any message.
该方案能受到替换公钥攻击，以至于任何人都能对任何消息成功伪造签名。
2·Wrapping attacks aim at injecting a faked element into the message structure so that a valid signature covers the unmodified element while the faked one is processed by the application logic.
波鸿鲁尔大学专家在2009年发表的研究论文中阐述道：“包装攻击旨在向信息结构中注入一个伪造的元素，在应用逻辑处理伪造元素的同时，有效签名可以覆盖未改过的元素。
3·It USES a default signature algorithm, SHA1 with DSA, to create a self-signed certificate valid for 180 days.
它使用默认的签名算法(SHA1和DSA)创建一个带有自我签名的证书，有效期为180天。
4·By verifying the signature, inquirers using the registry can also be assured that a signed entity is valid and that the publisher represented by the signature created it.
通过验证签名，使用注册中心的查询程序还可以确信一个经过签名的实体是有效的，并且它是由这个签名所代表的发布者创建的。
5·The signature is still cryptographically valid, as the body element in question has not been modified (but simply relocated).
因为消息体元素本身没有被修改（只是简单转移了位置），所以从密码学角度签名任然有效。
6·If the digital signature is valid, you will find the following screen.
如果数字签名是有效的，那么您会看到如下的界面。
7·An XMLSignature object can be created by unmarshaling the DOMValidateContext, and its validate method can return whether this signature is valid.
解组DOMValidateContext将创建一个XMLSignature对象，其validate方法可以返回表示签名是否有效的信息。
8·You can use any valid subroutine with a matching signature as an event handler.
您可以将任何带有匹配签名的有效子例程用作事件处理程序。
9·The Interactive Resolver Component does not have a valid digital signature.
交互式冲突解决程序组件没有有效的数字签名。
10·The time draft is to be countersigned by the bank of China Beijing certifying that your signature is true and valid.
汇票要由北京中国银行附签，以证明你方签字是真的和有效的。