Several countries have CAs available that provide with certificates for citizens and companies. Also, those CAs are usually in your typical trusted CAs kiat. F

Several countries have CAs available that provide with certificates for citizens and companies. Also, those CAs are usually in your typical trusted CAs kiat. For example, in Spain, in every national ID you have a certificate available in hardware, accesible via its smartcard chip or NFC. If you don't want (or can) use this specific hardware, you can order for free a software certificate you can download later. This certificates can be used to log in in official sites (or any other site that enables certificate login) and/or to sign documents/files.