Method for generating a soft token, computer program product and service computer system

A method is provided for generating a soft token by which attributes of a user may be authenticated. A request to generate the soft token is transmitted from an electronic device of the user to a service provider computer via a first secure connection. After receiving the request, the service computer generates a one-time password, records the password as a session identifier, and transmits the password to the electronic device. The password is output by the electronic device via a user interface. The user enters the password into a user computer system, from where it is transmitted, via a second secure connection, to the service computer system. If the recorded password agrees with the received password, one or more attributes are read from an ID token of the user and a corresponding soft token is generated and transmitted to the electronic device or user computer system.