Authentication method for enabling a user of a mobile station to access to private data or services

1. Method for accessing private data or services from a mobile station over a public network including the step of authenticating a user of the mobile station for accessing to private data/services, comprising the steps of:

• composing a text-based request message on the mobile station using a standard public text messaging protocol, said message including a request for private data, and sending said request message to a private server (MG, PS) offering the access to said private data/services, via the telephone network,checking the authenticity of the user of the mobile station based on the request message received by the server,if the authenticity of the user of the mobile station is confirmed, composing a text-based response message using a standard public text messaging protocol, the response message including the requested private data/services of the private server, and sending back to the mobile station said text-based response message, via the telephone network,wherein the request message additionally includes a user unique identifier, and is received by the private server with an appended user mobile station number,wherein the authenticity checking performed by the private server comprises the steps of;
  
  checking whether the user unique identifier is stored in a private directory database, andchecking whether the appended user mobile station number matches with the user mobile station number allocated to the user unique identifier stored in the private directory database;
  
  and wherein, if the user authenticity is confirmed, an interaction between the private server and the mobile station is limited to the exchange of the text-based request message and the text-based response; and
  
  repeating the recited steps for any further interaction between the private server and the mobile station.