求翻译：随着3G移动通信网络的发屏和普及，人们在享受名种信息服务的同时，移动通信网络的安全性将变得越来越重要。本文首先介绍了移动通信的发展，随后介绍了对移动通信网络安全框架的理解，并以3GPP等为研究对象，从用户域、接入域、网络域、业务域和安全算法的发展讨论第二代移动通信网络安全技术的发展现状。并提出了国内第二代移动通信网络存在的安全问题。本文还综述了GSM网络的安全机制，第二代移动通信系统应采取的安全机制，合法的窃听及EI'SI加密算法的生成过程。是什么意思？

As the 3G screen and the popularity of mobile communications network, while people are enjoying the kinds of information services and security mobile communications network will become increasingly important. This article first describes the development of mobile communications, then introduced the understanding of the mobile communication network security framework, and for the study of objects such as 3GPP, from user domains, access domain, network domain, the business development of algorithm for domain and security discussions of the second generation of mobile communication network security technology development. And proposed domestic security problems of the second generation of mobile communications network. This article also provides an overview of GSM network security, security mechanisms for second generation mobile communication systems should be taken, lawful interception and encryption algorithm EI'SI the build process.