Authentication method secured by structural decoupling of personal and service identifiers

An authentication method for a secure transaction of a security identifier, without a token, including a new user registration step comprising:

• recording on a first computer a profile associated with a single user, the profile being associated with at least one service identifier associated with a service, registered on a second computer different from the first computer, the service being accessible by the user,
• when a central computer receives an identifier and a service identifier, executing a step of generating a master key,
• and, during a transaction, proceeding with a step of opening a session on a network comprising the first computer and a host system which hosts a set of computers comprising giving access to the computers in order to obtain the user profiles, services and personal information and retroact with the computers as well as a computer key interacting with the computers to provide public keys and to manage respectively exchanges involving the identification information, the services and the personal information;
• retrieving, controlling and transmitting the information necessary for the transaction, including the digital identifier acquired by the first computer as well as the associated information,
• transmitting, controlling and reconciling the user profiles, the service identifiers and the personal information provided by a function, and then obtaining the service selected by a client by proceeding with the acquisition of the profile of the user to transmit it to the first computer for comparison with the recorded identifiers and to search for and activate, on the computers, at least one service associated with the user identifier,
• the new user registration step comprising:
• when the central computer receives an identifier and a service identifier, executing the step of generating the master key,
• wherein the master key is a temporary random key,
• then generating a reference identifier, calculated by applying a non-reversible reference cryptographic function to the temporary random key, and recording in a computer table the unique pair of the identifiers recorded on the computer, and
• generating at least one service identifier, calculated by applying a non-reversible reference cryptographic function different from the function, to the temporary random key, and recording in a computer table the unique pair of the identifiers recorded on the computers.