Method for authenticating a user towards a multi-node party

A method for authentication of a user towards a multi-node party, the multi-node party comprising at least two nodes, the method comprising the steps of:

• the user contacting each of the nodes of the multi-node party, via a user application,
• each of the nodes of the multi-node party generating a nonce and returning the nonce to the user application,
• the user application requesting authentication from an Identity Provider, based on the nonces received from each of the nodes of the multi-node party and on a unique identity of the user,
• the Identity Provider generating a message, based on the request for authentication and on the nonces generated by each of the nodes, and providing the message to the user application,
• the user application providing the message in a secret form to each of the nodes of the multi-node party,
• the nodes of the multi-node party verifying the message, based on the received secret form of the message and by means of secure multi-party computation performed by the at least two nodes in cooperation, and
• authenticating the user based on the secure multi-party computation.