3G网络USIM卡COS的安全研究与实现

安全功能研究是USIM卡操作系统（cos）的最核心的部分，确保卡系统的安全。本文通过对3G网络中USIM卡存在的安全威胁的分析，并与SIM卡安全功能进行比较，结合3G的国际标准，设计出USIM卡COS的安全管理功能模块，提出以C语言实现的针对USIM卡专用的加密算法函数库的接口API。安全功能主要从文件访问机制、鉴权算法、加密算法接口API等方面进行分析和设计。本文的研究成果已经成功应用到卡的芯片中，有效解决USIM卡存在的安全威胁，确保卡中储存资源的安全和通信业务的正常应用。

the security research of USIM Card in the net of 3G

Research of security function is the core part in USIM Card (COS),acting as a role to ensure system security of the Card. In this thesis,we analyze the security threat of USIM Card in the net of 3G,comparing the security function in USIM Card with that of SIM Card,then design a security management function module by combining with 3G interna-tional standard. and bring forward C language realize encrypt arithmetic interface for USIM card. The analyse and design are mainly undertaken from document accessing management,authentication algorithm and en-crypt algorithm. This design effectively solves the problem of security threat existed in USIM Card,and ensures the safety of end user's depos-ited resource as well as the normal use of communication operation