Mobile telecom user authentication method for mobile communications networks operates during use of a services server in a second service network as the services server organizes a first service

摘要

A user gets a tag (Token) and a public identification key (User-ID) when logging on with an operator of a first service network (IMS) and/or when registering in the first network. This tag and ID are transmitted to a services server (SS) in a second services network (SSN). A telecom terminal (UE) sends a random number (RAND1) plus the ID with an authentication request to the SS in the SSN.