基于智能卡的身份认证过程中为了产生变动的口令，一般采用双运算因子的计算方式，也就是加密算法的输入值有两个数值，为（20）。
- A.用户名、固定因子
- B.用户名、变动因子
- C.用户密钥、固定因子
- D.用户密钥、变动因子
正确答案及解析
正确答案
解析
身份认证过程中为了产生变动的口令，一般采用双运算因子的计算方式，也就是加密算法的输入值有两个数值，其一为用户密钥、另一为变动因子。由于用户密钥为固定数值，因此变动因子必须不断变动才可以算出不断变动的动态密码。认证双方必须随时保持相同的变动因子，才能算出相同的动态口令。
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