Method, system and centre for authenticating in End-to-End communications based on a mobile network

The present invention provides a first service entity and the second service entity and an entity authentication center, to be applied to a system including the EAC, the authentication method in an end-to-end communications based on a mobile network that provides service to request a service, performing a mutual authentication between the each of the first service entity and the EAC, and between the second service entity and the EAC according to the negotiated authentication mode; If the first service entity requests the second service entity to provide the service, EAC will provide authentication inquiring for the first service entity and the second service entity according to the negotiated authentication mode, the driven shared according to the negotiated authentication mode, generating a same key; And the first service entity and the second service entity and the shared derived key, and authenticate each other according to the negotiated authentication mode, and generating a session key for protecting the service.