問題文
Two colleagues want signed mail but their client is prepared for S and MIME rather than OpenPGP. What does each of them need before the first signed message can be checked by the other side?
選択肢
- Each user needs a certificate for the mail address that an application has signed and the other side must already trust the certificate that sits at the top of the chain rather than the one that sits at the bottom.
- Each user needs a certificate for the mail address that an application has signed and the other side must already trust the certificate that sits at the end of the chain rather than the one that sits at the start.
- Each user needs a certificate for the mail address that an authority has signed and the other side must already trust the certificate that sits at the top of the chain rather than the one that sits at the bottom.
- Each user needs a certificate for the mail address that an authority has signed and the other side must already trust the certificate that sits at the end of the chain rather than the one that sits at the start.