1. US20110078442 - METHOD, DEVICE, SYSTEM AND SERVER FOR NETWORK AUTHENTICATION

A method, a device, a system and a server for network authentication are provided. The method includes: receiving a user authentication request forwarded by a second Access Management Functional Entity (AM-FE) when a user is attached to the second AM-FE from a first AM-FE; obtaining an authentication key of a security domain of the second AM-FE according to the user authentication request; and authenticating the user by using the authentication key. The following problems are solved: packets of user services are lost and even services are temporarily interrupted because of long time consumption and poor security during intra-domain or inter-domain handover of the user. Therefore, the safe authentication of the user's intra-domain or inter-domain roaming is achieved, and thus the security and reliability of user authentication are improved.