中文摘要：

签名只有接受者才能验证的数字签名方案称之为有向签名．在大多数情况下，有向签名通常是一个人，然而当所需签名的消息代表一个群体时，就需要群体中的一部分人同意，门限签名方案就被用作解决这个问题．文章运用中国剩余定理，提出了基于中国剩余定理、ELGamal公钥密码理论和Schnorr理论的（t，n）有向门限签名方案．

英文摘要：

The signature on the message should be such as only the signature receiver can verify the signature and prove the validity of the signature to any third party. In most cases, the signer is generally a single person. However when the message is on behalf of an organization, a valid message may require the approval or consent of several people. Threshold signature is an answer to this problem. This paper proposed a （t,n） directed threshold signature scheme based on the Chinese Remainder Theorem and Schnorr＇s signature scheme.