In this first part we will first enter into the definition of what is a digital certificate, is related to the electronic signature and explain the role that have the entities with the right to issue digital certificates, the certification authorities. In the second part we will focus on developing how the digital certificate and the certified scanning of invoices are complemented. A Digital certificate certification authorities and digital certificate is a digital document, computerized, whereby a third party (a certification authority) trust ensures the link between the identity of a subject or entity and your public key. We will explain what is the public key later. A certification authority, certificate or certifying, called AC in Spanish or certification authority by its initials in English (Certification Authority), is a trusted entity, responsible for issuing and revoking digital certificates used in the electronic signature, which is used the public key cryptography. Legally it is a particular case of certification services provider. Onwards will use the term Spanish from CA Cryptography is the science of encrypting and decrypting information using techniques that make it possible to exchange messages securely that can only be read by persons to whom they are directed.
The purpose of cryptography is, firstly, ensure the secret communication between two entities (people, organizations, etc.) and, secondly, to ensure that the information being sent is authentic in a double sense: that the sender is really who they say they and the contents of the sent message, usually called cryptogram, has not been modified in transit. There are various formats for digital certificates, more commonly employees are governed by the ITU-TX 509 standard. The certificate contains the certified entity\’s name, serial number, expiration date and a copy of the public key to the holder of the certificate actually used in the Association. Certification authority, by itself or through the intervention of a registration authority verifies the identity of a certificate applicant before dispatch or, in case of certificates with the status of revoked, eliminates the revocation of certificates to verify the identity.