The term Client signature refers to the signature with the signer’s digital certificate.
![](https://www.viafirma.com/wp-content/uploads/2020/12/client_signature_1.png)
The system supports several signature formats PAdES (PAdES B, PAdES T, PAdES LT y PAdES LTV), some of which involve the use of timestamps.
![](https://www.viafirma.com/wp-content/uploads/2020/09/pades.png)
We can also add a help text for the signer:
![](https://www.viafirma.com/wp-content/uploads/2020/09/digital-cert.png)
And a recipient key associated to the signature with certificate:
![](https://www.viafirma.com/wp-content/uploads/2020/12/client_signature_2.png)
Finally, there is the option of using an existing user in Fortress.
![](https://www.viafirma.com/wp-content/uploads/2020/12/client_signature_3.png)
During the signing process the signatory will see this:
![](https://www.viafirma.com/wp-content/uploads/2020/09/digital-certificate-signaturee.png)
Should you have any questions, please contact us to: helpdesk@viafirma.com