问题
单项选择题
在DES算法中，需要将明文分组右半部扩展置换，扩展置换是实现明文换位和（）扩展。
A.24位到48位
B.32位到48位
C.64位到128位
D.16位到32位
答案
参考答案：B
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在DES算法中，需要将明文分组右半部扩展置换，扩展置换是实现明文换位和（）扩展。
A.24位到48位
B.32位到48位
C.64位到128位
D.16位到32位
参考答案：B
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