Signature not working

[יאיר275035574035]

I was sent a signed file and when I open it, I can't see the signature. I have a message saying "At least one signature has problems" and it directs me to the Signature Panel and when I click on it, it says the signature validity is unknown.

[try67]

As is stated in that dialog, this signature field is invisible. But the signature is still there, it's just not validated.

You would need the public key from the signer to validate it.

[יאיר275035574035]

And in case I get the public key, what is the process of validating it?

[try67]

Add it to your list of trusted certificates, then right-click the signature and select Validate Signature.

[יאיר275035574035]

Managed to validate it but still can't see it

[try67]

There's nothing to see. It's an invisible signature.

[יאיר275035574035]

It should be visible.
I think it is only invisible for me.

[try67]

Why do you think that?

It clearly states in the signature's properties it's hidden.

[MikelKlink · Accepted solution]

You seem to think that invisible signatures are somehow bad. They are not. At least not in general.

But if you are sure the signature should be visible in the document, and if the document is not confidential, you may share it here, so we can analyze it. If the signer cooperates, you may alternatively create a new document without confidential information, let the signer sign it, and if the signature again is invisible in contrast to expectations, you can share that document.