目前在信息系统中使用较多的是 DES 密码算法，它属于 （）类密码算法。
- A.公开密钥密码算法
- B.对称密码算法中的分组密码
- C.对称密码算法中的序列密码
- D.单向密码
正确答案及解析
正确答案
解析
密码算法一般分为传统密码算法（又称为对称密码算法）和公开密钥密码算法（又称为非对称密码算法）两类。对称密钥密码体制从加密模式上可分为序列密码和分组密码两大类。分组密码的工作方式是将明文分为固定长度的组，对每一组明文用同一个密钥和同一种算法来加密，输出的秘文长度也是固定长度的。信息系统中使用较多的DES密码算法属于对称密码算法中的分组密码算法。
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