Could someone bypass a GPG key’s expiration date by simply using that key on a computer with an incorrect system time?

I’ve heard it’s good for security to have a shorter expiration time for GPG keys, but I’m still not clear on why that is exactly. Is the purpose of a GPG key mainly to inform the legitimate user that they ought to generate a key at some p… Continue reading Could someone bypass a GPG key’s expiration date by simply using that key on a computer with an incorrect system time?

How can I prove the content of a PGP-encrypted message to a third party?

Imagine this scenario

A StackExchange user sends you a PGP-encrypted message
You decrypt the message and discover that you are being blackmailed
You report the message to the admins but they are unable to view the content

In this situati… Continue reading How can I prove the content of a PGP-encrypted message to a third party?