In the 21st century society, facing the global market is an unavoidable requirement. Ensuring the technical and legal interoperability of the electronic signature is essential.

The dematerialization of processes is unstoppable and, therefore, providing legal security to electronic documents and transactions regardless of where the operators are located is the challenge that must be faced.

Most countries already have certificate issuers and, therefore, at the local level can already use electronic signature to provide legal security to electronic transactions. Unfortunately, the scope of these legal evidences is geographically limited to the scope of the legal jurisdiction in which the CA operates. Generally, the paradox occurs when electronic signatures stamped on a document are only partially valid, that is to say, each party in the country in which it resides.

The reality is that nowadays the relations are international and the electronic signature is called to provide legal security to the documents and transactions in which the operators are citizens of different countries and, in turn, the certificates they use are issued by CA's officially accredited in other countries. It is evident that Spain is a host country, and there are many citizens who, in order to carry out procedures in their countries of origin, need to have certificates recognized in their respective public or private administrations.

To solve this technological and legal challenge, ANF AC has signed International Agreements with Electronic Certification Service Providers of an extra-community scope, specifically, in those countries in which ANF AC is not accredited. Thanks to this agreements it can intervene on behalf of the CA accredited in its country of origin, for the purposes of identification tasks, and processing of electronic certificates that will be issued by the respective CA's, recognized them by the competent authorities in their respective countries.