Technique for connecting to a service

A technique for connecting a user device to a service. The device sends a request to connect to the service, a user identifier of the device from a trusted entity being associated with the request. The trusted entity sends a reply to the request back to the device. This reply includes data about a uniform resource locator associated with the service and a single-use code and is sent to a contact address associated with the user identifier from the trusted entity. The device then sends a request to access a page of the service, the address of which corresponds to the data, the received single-use code being associated with the access request. Connection to the service is authorized for the service identifier associated with the user identifier from the trusted entity, when a single-use code received from a server implementing the service, in combination with a service identifier request, is valid.