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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>3-40 鉴权<O:P>
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</SPAN><FONT color=#0000cc>(3) 加密<O:P>
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color=#000066>GSM系统中的加密也只是指无线路径上的加密，是指BTS和MS之间交换客户信息和客户参数时不被非法个人或团体所得或监听，加密程序见图3-41所示。在鉴权程序中，当客户侧计算SRES<SPAN
style="mso-spacerun: yes"> </SPAN>图3-39
三参数组的提供时，同时用另一算法(A8算法)也计算出密钥Kc。根据MSC／VLR发送出的加密命令，BTS侧和MS侧均开始使用Kc。在MS侧，由Kc、TDAM帧号和加密命令M一起经A5算法，对客户信息数据流进行加密(也叫扰码)，在无线路径上传送。在BTS侧，把从无线信道上收到加密信息数据流、TDMA帧号和Kc，再经过A5算法解密后，传送BSC和MSC。<O:P>
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size=3>所有的语音和数据均需加密，并且所有有关客户参数也</FONT></SPAN></FONT><SPAN
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face=楷体_GB2312 color=#000066 size=3>均需加密。<SPAN lang=EN-US><O:P>
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face=楷体_GB2312 color=#000066 size=3>图<SPAN lang=EN-US>3-41 加密<O:P>
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</SPAN><FONT color=#0000cc>(4) 设备识别<O:P>
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color=#000066>每个移动台设备均有设备识别码(1MEl)，移动台设备如允许进入运营网，必需经过欧洲型号认证中心认可，并分配一个十进制6位数字，占用IMEI
15位十进制数字的前6位设备识别的作用就是确保系统中使用的移动台设备不是盗用的或非法的。设备的识别是在设备识别寄存器EIR中完成。<O:P>
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</SPAN><FONT face=楷体_GB2312 color=#000066>EIR中存有三种名单：<O:P>
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</SPAN><FONT face=楷体_GB2312 color=#000066>白名单---
包括已分配给可参与运营的GSM各国的所有设备识别序列号码。</FONT><O:P> </O:P></FONT></SPAN></P>
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</SPAN><FONT face=楷体_GB2312 color=#000066>黑名单---
包括所有应被禁用的设备识别码。<O:P> </O:P></FONT><FONT
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</SPAN><FONT face=楷体_GB2312 color=#000066>灰名单---
包括有故障的及未经型号认证的移动台设备，由网路运营者决定。<O:P> </O:P></FONT></FONT></SPAN></P>
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face=楷体_GB2312 color=#000066 size=3>设备识别的程序见图<SPAN
lang=EN-US>3-42，MSC／VLR向MS请求IMEI，并将其发送给EIR，EIR将收到的IMEI与白、黑、灰三种表进行比较，把结果发送给MSC／VLR，以便MSC／VLR决定是否允许该移动台设备进入网路。<O:P>
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