Method for authenticating a device

A server comprising a non-transitory computer readable medium, the medium storing a profile associated to a user of a first device, the server being adapted for:

• receiving a request for authentication from the first device;
• upon reception of the request for authentication, using the profile of the user to generate and to send to the first device a first challenge comprising a question about a characteristic of the first device and a corresponding response for authentication of the first device;
• and
• authenticating the first device using the first challenge based on a response to the first challenge issued by the first device independent of user input, wherein a successful authentication of the first device using the first challenge triggers:
• immediately collecting contextual information from the first device, the contextual information including information that uniquely identifies the first device;
• and
• updating the profile associated to the user of the first device with the collected contextual information for a subsequent generation of a second challenge including a second question about another characteristic of the first device for authentication of the first device.

An application program embodied on a non-transitory computer readable medium and arranged to execute a method for authenticating a first device, the method being executed by a second device, the second device comprising a database, the database storing a profile associated to a user of the first device, the method comprising:

• receiving a request for authentication from the first device;
• upon reception of the request for authentication, using the profile of the user to generate and send to the first device a first challenge comprising a question about a characteristic of the first device and a corresponding response for authentication of the first device;
• and
• authenticating the first device using the first challenge based on a response to the first challenge issued by the first device independent of user input, wherein a successful authentication of the first device using the first challenge triggers:
• immediately collecting contextual information from the first device, the contextual information including information that uniquely identifies the first device;
• and
• updating the profile associated to the user of the first device with the collected contextual information for a subsequent generation of a second challenge including a second question about another characteristic of the first device for authentication of the first device.