在DES加密算法中,使用的密钥有效长度是( )。
本题考查DES加密算法的基础知识。在DES(Data Encryption Standard,数据加密标准)中,其密钥长度形式上是一个64位数,但有效密钥为56位。DES以64位(8字节)为分组对数据加密,每64位明文经过16轮置换生成64位密文,其中每个字节有1位用于奇偶校验,所以实际有效密钥长度是56位。
( )is the process of transforming information so it is unintelligible to anyone but the intended recipient.
As each application module is completed,it undergoes( )to ensure that it operates correctly and reliably.
( )algorithm specifies the way to arrange data in a particular order.
After analyzing the source code,( )generates machine instructions that will carry out the meaning of the program at a later time.
( )can help organizations to better understand the information contained within the data and will also help identify the data that is most important to the business and future business decisions.
浏览器开启无痕浏览模式后,( )依然会被保存下来。
下列协议中,不属于TCP/IP协议簇的是( )。
下列传输介质中,带宽最宽、抗干扰能力最强的是( )。
数控编程常需要用参数来描述需要加工的零件的图形。在平面坐标系内,确定一个点需要2个独立的参数,确定一个正方形需要( )个独立的参数。
某书的页码为1,2,3,...,共用数字900个(一个多位数页码包含多个数字),据此可以推断,该书最大的页码为( )。