Validation of the seat certificate
According to Article 11.2(d) of Royal Decree 203/2021 of 30 March, which approves the Regulation on the performance and operation of the public sector by electronic means, electronic venues shall have a system for verifying headquarters certificates.
You will be able to verify the validity of the certificate of the electronic headquarters of the Tax Agency, directly and free of charge, through the VALIDe platform.
Seat certificates have the utility of identifying and ensuring secure communication with electronic headquarters, so that they do not allow malicious intrusion by third parties.
According to the ICT Security Guide CCN-STIC 807 Cryptology of use in the National Security Scheme the cryptographic protocols and algorithms allowed in the 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_CHACHA 20_POLY1305_SHA256