系统安全性保护措施包括物理安全控制、人员及管理控制和（ ）
- A.存取控制
- B.密码控制
- C.用户控制
- D.网络控制
正确答案及解析
正确答案
解析
系统安全性保护措施为保证系统安全，除加强行政管理外，并采取下列措施：（1）物理安全控制。物理安全控制是指为保证系统各种设备和环境设施的安全而采取的措施。（2）人员及管理控制。主要指用户合法身份的确认和检验。用户合法身份检验是防止有意或无意的非法进入系统的最常用的措施。（3）存取控制。通过用户鉴别，获得使用计算机权的用户，应根据预先定义好的用户权限进行存取，称为存取控制。（4）数据加密。数据加密由加密（编码）和解密（解码）两部分组成。加密是将明文信息进行编码，使它转换成一种不可理解的内容。这种不可理解的内容称为密文。解密是加密的逆过程，即将密文还原成原来可理解的形式。
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