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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
It has a valid digital signature indicating its name and its publisher, which helps to ensure that the program is what it claims to be.
它具有指明其名称和发行者的有效的数字签名，该数字签名可以帮助确保该程序正是其所声明的程序。
But except of the signer, anyone else (including the confirmer) can not generate a valid confirmer signature on behalf of the signer.
但除了签名者，其他任何人(包括证实者)都不能以签名者的名义产生有效的证实签名。
A trusted source. Signature is valid.
可信来源。签名有效。
This paper shows that Chen - Zhu's scheme is universally forgeable, that is, the group authority can forge a valid group signature on an arbitrary message, which stands in any group member.
该文认为该方案是全局可伪造的，群管理员可以对任何消息假冒任何成员生成有效的群签名。
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实有效的。
A dishonest PKG could forge a valid partially blind signature.
不诚实的PK G可以伪造一个有效的部分盲签名。
If the digital signature is valid, the trusted application domain host passes the signature information as evidence to the runtime's policy mechanism.
如果数字签名有效，则受信任的应用程序域宿主将签名信息作为证据传递给运行时的策略机制。
This paper will show that Zhang et al. 's scheme is insecure, any group member colludes with repeal center can generate a valid group signature without using his secret parameters.
该文提出了一种伪造攻击方案指出张等的方案是不安全的，任一群成员在撤消中心的帮助下可以不利用自己的秘密参数对任何消息生成有效的群签名。
Furthermore, the proposed scheme can prevent the original signer from generating a valid proxy ring signature, thus the profits of the proxy signer are guaranteed.
提出的方案能够防止原始签名人生成一个有效的代理环签名，从而保护了代理签名人的权益。
The Contract is written in quadruplicate (two for original and copy respectively) which shall become valid on the date of signature.
本合同一式四份(正副本各两份)自签署后生效。
This page when properly endorsed, may be used for reentry of the student to attend the same school after a temporary absence from the United States. Each certification signature is valid for one year.
本页如果准确背书，可用来美国在校生阶段性休学后在同一所学校再登记(入学)，每份证书签字的有效期为一年。
If the file gets changed, the checksum changes as well and the digital signature isn't valid anymore.
如果这些文件改变了，校验也就改变并且数字签名也就无效了。
If the values match, the signature is confirmed to be valid.
如果值匹配，则确认签名有效。
The digital signature attached to the message is not valid.
附加到消息上的数字签名无效。
This certificate is valid for three months and not used for litigation and military service. It is invalid without the seal of hospital and signature of physician.
本证明书效期三个月，非供诉讼、兵役使用，未经诊断医师签章及未加盖处印，均属无效。
This application form is a valid contract when with the authorized signature and the official seal.
此参展申请表，一经签字、盖章具有法律效力。
Note: The drawee's signature alone is a valid acceptance and is usually made across the left margin of the bill of exchange.
注：汇票经受票人本人签名生效，其签名通常横贯至汇票左边。
Note: The drawee's signature alone is a valid acceptance and is usually made across the left margin of the bill of exchange.
注：汇票经受票人本人签名生效，其签名通常横贯至汇票左边。
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