E-Office certificate validation
As established in article 11.2 d) of Royal Decree 203/2021, of March 30, which approves the Regulations for the action and operation of the public sector by electronic means, the electronic offices will have a verification system for certificates of headquarters.
You will be able to verify the validity of the certificate from the electronic headquarters of the Tax Agency, directly and free of charge, through the platform
Headquarters certificates have the purpose of identifying the electronic headquarters and guaranteeing secure communication with them, so that they do not allow malicious intrusion by third parties.
According to the ICT Security Guide CCN-STIC 807 Cryptology for use in the National Security Scheme, the cryptographic protocols and algorithms allowed in access to the electronic headquarters are:
TLS 1.2
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS 1.3
TLS_AES_128_GCM_SHA256
TLS_AES_256_GCM_SHA384
TLS_CHACHA20_POLY1305_SHA256