What is it?
The T-CAT pseudonym is a qualified signature certificate for a public employee with a pseudonym from the AOC Consortium Certificate Catalog , specific for cases where the holder's data cannot be displayed.
There are two types of pseudonym certificate:
T-CAT of pseudonym (qualified certificate on card)
T-CAT Pseudonym P (Certificate of Advanced Level in Software)
Personal and identification data (name, surname, DNI) do not appear in the certificate, as they are replaced by the pseudonym indicated. For this reason, it does not allow authentication in applications (such as EACAT, Portasignatures or other AOC or State tools).
Therefore, the potential holders of the T-CAT pseudonym are people who, within their organization, already have a regulated pseudonym: prison officials, Mossos d'Esquadra, local police, etc.
When can a pseudonym be used?
The identity of the person must be protected, in accordance with article 23.1 ofRoyal Decree 203/2021, of March 30 , for reasons of:
Public security: provided for in article 43.2 of Law 40/2015, of 1 October and applicable, for example, to the local police or the Mossos d'Esquadra.
Other actions in which anonymity is legally justified: for example, in the case of social services, article 45.4 of Law 12/2007, of October 11, on social services provides for the adoption of measures to protect the identity of personnel in this area.
Classified information: regulated in Law 9/1968, of April 5, on official secrets and Decree 242/1969, of February 20 and must be declared as such by the Council of Ministers of the State, therefore it is not applicable to the local police.
National defense: regulated by Law 5/2005, of November 17, on National Defense and applicable essentially to state-level bodies such as the Civil Guard, the National Police, the National Intelligence Center or the AOC only reveals the identity of the person when required by judicial bodies and other public authorities in the exercise of their functions.
What should a pseudonym be like?
The pseudonym is always provided by the Administration , according to its criteria.
It can be:
Professional Identification Number (NIP), only when the NIP is not related to personal data, such as the DNI.
Alternatively, other indicators.
However, it is recommended that the pseudonym does not include the position , for example INSPECTOR 0078, because - among other reasons - any modification of the position entails the revocation of the certificate.
How can I request the T-CAT pseudonym?
You can request pseudonym Certificates via EACAT through the form available to you in the procedures section of EACAT > AOC Consortium > Digital Certification Service.
Specifically the option “T-CAT: Request and renewal of pseudonym or representative certificates"

Note: In this section you will also find requests for other certificates from the AOC Digital Certificate Catalog.
Then, download the PDF and fill in the information indicated on the application. Once you have filled in all the information, sign the request and send it.
You must keep in mind that the form allows you to make multiple requests at the same time by clicking on the (+) option.

Regarding the information in the application, it is recommended that the organic unit of the person holding the certificate be indicated , as it facilitates the justification of the need to use the pseudonym.
What requirements must the application for T-CAT pseudonym meet?
Justification of the request : indicate the reason why you are requesting the certificate with a pseudonym
Use for public safety
Use for classified information
Use for defense
Other actions where legally justified. In this case, the legal norm and the specific article must be indicated.
Indication of the employee's pseudonym: according to section 3. What should a pseudonym be like?
Provide an email address : all certificates in the AOC Digital Certificate Catalog include an email address (required information). In the case of the T-CAT pseudonym, it is recommended that the email address you provide avoid using combinations of the person's first and last name ; it can be configured based on the workplace and/or the NIP (example: agentT1111@policialocal.cat), and it is also not recommended that they be shared emails.
Provide documentation that proves the identity of the signatory.
Where applicable, provide the previous report from the competent cross-cutting body in matters of promoting the digital administration of the Generalitat de Catalunya (provided for in art. 53.3 of Decree 76/2020, of August 4, on digital administration).
We also attach the report with the references of these requirements to the regulations.
When will the pseudonymous T-CAT be issued?
The delivery period for the pseudonymous T-CAT is:
Ordinary service : maximum 20 working days.
Urgent service : 4 working days, limited to 5 requests per entity per week. Urgency is only for renewals, loss or theft,
When we receive your request, the AOC assesses the legal accreditation of the pseudonym you indicated in the request and issues, if applicable, the certificates.
After issuance, AOC will charge the corresponding amount, in accordance with the current public prices for the Digital Certification Service.
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