The server's certificate has an invalid signature.

服务器的证书中有一个无效的签名。

youdao

Version 4 also displays a warning when a key or message has an invalid signature.

另外，当金钥或讯息具有无效的签章时，版本4也会显示警告。

youdao

As soon as the byte codes of the agent change, the old user signature becomes invalid.

代理的字节代码一变更，旧的用户签名就变成无效的了。

youdao

Nobody knows for certain what constitutes a valid signature, nor whether a fresh petition can be presented if the first one is ruled invalid, nor even whether the president could stand again if voted out.

ECONOMIST: California comes to Caracas