Anonymous access to a service by means of aggregated certificates

A method of anonymous access to a service, comprising:

• the allocation, by at least one certifying entity, of a plurality of certificates to a user entity, said certificates being calculated on the basis of at least one attribute associated with the user entity, the allocation of the plurality of certificates comprising, for each of the certificates allocated by the certifying entity:
• the calculation of a certificate by means of public data linked to a secret key of the user entity, at least one attribute associated with the user entity, and a secret key of the certifying entity;
• and
• the transmission of the certificate to the user entity;
• the calculation, by the user entity, of an aggregated certificate on the basis of a plurality of certificates among the certificates allocated to the user entity;
• the calculation, by the user entity, of a proof of knowledge of the aggregated certificate;
• and
• a verification, performed by a verifying entity, of at least one of said certificates by means of said proof of knowledge, the access to the service being provided by the verifying entity to the user entity as a function of the result of said verification.