Can I modify the document when it already includes signatures and evidences?
Are you wondering if you can modify a signed document?...
Can I modify the document when it already includes signatures and evidences? Read More »
Frequently Asked Questions (FAQs)
Find answers to the most common questions we are asked, categorized by subject. Find answers about the legality of our products, their operation, integrations or generalities.
Is OTP SMS signature legally binding?
The signing process involving the use of OTP Text message/SMS...
What is a Certification Authority?
The Certification Authority (CA) is a trusted entity responsible for...
What is cloud based signature or centralized signature?
Cloud signature or centralized signature is a very secure authentication...
What is cloud based signature or centralized signature? Read More »
How to install a digital certificate on Android
Thanks to Viafirma, signing electronically from mobile devices is possible....
What X.509 standard certificate file extensions exist?
The X.509 certificate extensions supported by this file are: .CER...
What X.509 standard certificate file extensions exist? Read More »
What are digital certificates?
Definition and types Digital certificates are digital documents through which...
What are the differences between server and client signature?
Depending on the location where the electronic signature is carried...
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What Certification Authorities (CA) are supported by Viafirma?
In Europe Following the entry in force on 1st July...
What Certification Authorities (CA) are supported by Viafirma? Read More »
Exporting a certificate with or without a private key
Do you know the difference between exporting a certificate with...
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What level of electronic signature can be achieved with a mobile device?
The electronic signature in mobile devices through Viafirma’s services can...
What level of electronic signature can be achieved with a mobile device? Read More »
Electronic ID card (DNI electrónico in Spanish)- frequent questions
I cannot remember my Electronic ID card PIN. How can...
Electronic ID card (DNI electrónico in Spanish)- frequent questions Read More »
Adobe: “The validity of the document certification is unknown. The author cannot be verified”
Sometimes when we open a signed PDF, Adobe Acrobat Reader...