Secured Authentication Method for Providing Services on a Data Transmisson Network

A method for accessing a service on a data transmission network, by means of a user terminal (30) connected to said network, characterised in that it includes:

• a) a phase for subscribing to said service, wherein:
• an information container (TOKEN) associated with the user is generated, including a first set of authentication data (X0, X1, X2, X3) for accessing the service and a second set of useful data relating to said user (SID/PN) and to access rights to said service (RBF, UBF, TBF), said first and second sets of data being encrypted, and wherein,
• said container is transmitted (d) securely on said user terminal (30), and
• b) a phase for accessing said terminal wherein
• said container is transmitted (e) securely from said user terminal (30) to at least one management server (40) connected to the network during a request to access said service, and wherein,
• after decryption of the constituent data of said container, the server (40) verifies (g) the validity of said first set of authentication data and, in the event that verification is successful, authorises (h) access to the service for its execution, based on said access rights for the second set of data.