签名

The main results obtained are as follows:(1)A new multisignature scheme for specified group of verifiers is proposed;(2) A new signature scheme with threshold shred verification is proposed.

作者取得的主要研究成果如下：(1)提出一个新的针对指定接收组的多重签名方案；(2)提出一个新的门限共享验证签名方案，并设计了一个新的口令共享认证方案，该方案可以弥补祁明等的方案的不足；(3)指出Lim et al。

The main results obtained are as follows:(1) A new multisignature scheme for specified group of verifiers is proposed;(2) A new signature scheme with threshold shred verification is proposed. Based on the proposed scheme, a new password shared authentication scheme is presented to repair the security flaw in Qi et al.

作者取得的主要研究成果如下：（1）提出一个新的针对指定接收组的多重签名方案；（2）提出一个新的门限共享验证签名方案，并设计了一个新的口令共享认证方案，该方案可以弥补祁明等的方案的不足；（3）指出Lim et al。

In the scheme, the signature can be verified independently by each of the n designated verifiers designated by the signer and no one else than the designated person can be convinced by this signature even if one of the designated verifiers reveals the secret value.

在此方案中，只有签名者指定的n个验证者可以各自独立地验证签名，并且即使其中某个指定验证者将自己的秘密值泄漏，其他的任何人也无法验证签名的真伪。

The main results obtained are as follows:(1)A new multisignature scheme for specified group of verifiers is proposed;(2) A new signature scheme with threshold shred verification is proposed. Based on the proposed scheme, a new password shared authentication scheme is presented to repair the security flaw in Qi et als scheme;(3) We point out some weaknesses of two directed signature scheme proposed by Lim et al.

作者取得的主要研究成果如下：(1)提出一个新的针对指定接收组的多重签名方案；(2)提出一个新的门限共享验证签名方案，并设计了一个新的口令共享认证方案，该方案可以弥补祁明等的方案的不足；(3)指出Lim et al。

The proposed scheme not only possesses the properties of Chain Verification Signature, but also contains the following properties: chain authorized verifiers can be easily added or deleted and the sub-secrets can be protected in time.

除了具有链式验证签名的一般特性外，还可以方便地增加或删除链式验证授权者，并在链式验证授权者或签名验证者泄漏子秘密时，可以及时地进行维护。

Third,in order to solve the problem of the contradiction between the authentication and the privacy,we construct a designated-verifier chameleon proxy signature scheme.Only the designated verifier can verify the validity of the signature which can efficiently prevent the forgery from the dishonest verifiers.

第三，为了解决认证性和隐私性相冲突的问题，我们基于身份密码系统并结合我们所构造的一个卡麦龙函数，提出了一种新的指定验证者卡麦龙代理签名方案，在该方案中，只有指定的接受者能够验证签名的有效性，该方案能够有效的保护验证者的利益。

In the following chapter, we considered the situation when the signers changed.

在随后的一章中，我们考虑了参与签名成员的一种变化情况，假设了参与签名的节点是某些实体的集合。

Furthermore, the new scheme is very simple and has the property that the size of a proxy multi-signature is independent of the number of the original signers.

在形式上，这个新的方案非常简单，而且最终的代理多重签名的长度是一定的，不受原始签名人个数的影响。

They are still secure against the original signers forgery attack.

我们的方法可以应用到存在原始签名人伪造的其他ElGamal类代理签名方案。

It has advantages such as low computation load, high efficiency and security, and that the length of signature does not increase when the new original signers join in.

该方案具有计算量小、效率高和安全性强等优点，且签名长度不随原始签名人的增加而增长。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。