单词：signer
n. someone who signs and is bound by a document
signer的用法和样例：
例句
- A digital signature is a data digest encrypted with the private key of the signer.数字签名是指使用签名人私钥加密的数据摘要。
- One can forge an effective proxy signature that will be accepted by the signature verifier and that will not identify the true signer to management.该攻击能够伪造出有效的代理签名，使签名验证人可以接受该代理签名，但管理中心并不能通过此签名来辨认出代理签名人的身份。
词汇搭配
- sign手势
- signatory签署者
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