Patent ID: 7865173

Claim:
An authentication method in a communication system including a Subscriber with a terminal, an Operator Node and a Service Provider Node, which authentication method is based on an SLA agreement between the Operator and the Service Provider, the method comprising the following steps: sending a service request to the Service Provider Node from the terminal, the request includes the Operator Node identity; checking in the Service Provider Node that the Operator node identity relates to an Operator having an SLA agreement with the Service Provider and if there is an SLA agreement then sending the Service Provider node Identity to the terminal and sending a Request for strong authentication from the terminal to the Operator Node, the request includes the Service Provider Node Identity; the Subscriber with terminal performing strong authentication with the Operator Node acting as Registration Authority; generating by the Operator Node a Mobile Strong Authentication Assertion MSAA; transmitting the generated MSAA to the Service Provider Node; and validating in the Service Provider node the MSAA.