| CPC H04L 9/50 (2022.05) [H04L 9/3239 (2013.01)] | 14 Claims |

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1. A method for authenticating a user with at least one application, called service application, said user being equipped with at least one user device, the method being implemented by an authentication device for authenticating the user and comprises:
a step of receiving, from said at least one service application, a request comprising at least one identifier of said user;
a first step of sending, to an application registered in a blockchain, a request comprising said at least one identifier of said user;
a second step of receiving, in response to the first sending step, a message comprising at least one first datum corresponding to a first address of a first user device of said at least one user device, said at least one first datum having been obtained based on said at least one identifier of said user; and
a second step of sending, to said first address of the first user device, a request to send a message comprising at least one authentication datum for said user to an address of said service application.
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