信息传输模型包含信源、编码、信道、解码、信宿和噪声。加密设备对应于模型中的（ ）。
- A.信源
- B.信宿
- C.编码
- D.信道
正确答案及解析
正确答案
解析
在信息的传输模型中，包括的要素有：
（1）信源：产生信息的实体，信息产生后，由这个实体向外传播。
（2）信宿：信息的归宿或接受者。
（3）信道：传送信息的通道。
（4）编码器：泛指所有变换信号的设备，包括信源到信道的所有设备：量化器、压缩编码器、调制器等。从信息安全的角度出发，编码器还可以包括加密设备，加密设备利用密码学的知识，对编码信息进行加密再编码。
（5）译码器：是编码器的逆变换设备，把信道上送来的信号转换成信宿能接收的信号。
（6）噪声：可以理解为干扰，（干扰信号传输的能量场，称为噪音），干扰可以来自于系统分层结构的任何一层，当噪声携带的信息大到一定程度的时候，在信道中传输的信息可以被噪声淹没导致传输失败。
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