ANF AC, as a preservation mechanism over time, provides re-signing service of all types of authenticated electronic documents: electronic signatures, electronic timestamps, electornic seals, etc.


This service has the objective of solving the risk that presupposes the obsolescence of the algorithms and keys originally used. Therefore, a re-signing is performed, using key lengths and algorithms attested as safe.


In case the elements that provide authentication fall into obsolescence, they will inevitably enter into the possibility that one of the parties repudiates it. To avoid this serious risk, it is necessary to re-sign before the keys and the associated cryptographic material becomes vulnerable.


Basically, by means of this re-signing service, previously issued timestamps in any of its modalities, are re-stamped. Timestamps are generated in binary format per the RFC 3161 "Internet X.509 Public Key Infrastructure Time Stamp Protocols" standard, defined by the Internet Engineering Task Force (IETF) for the Time Stamp protocol. In the case of electronic signatures, the AdES A format is used.


The service is deployed in WebService-Security mode, and integrated in Time Stamping Units (TSU).


Service access requirements

This is a solution that requires a license of use.


Legal Framework

Spanish Law 59/2003 on Electronic Signature in its article 18, it establishes the obligations of the Certification Service Provider of:

"Section b) 2º Report on the mechanisms to guarantee the reliability of the electronic signature of a document over time ".