问题
单项选择题
(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(57) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.
(59) is a device used to connect two separate network that use different communication protocol.
(60) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
（56）是（）
A.MD
B.RSA
C.DES
D.MIB
答案
参考答案：A
解析：
是一种单行道功能，他接受一个任意长度的信息，然后由它计算出一个固定长度的位串。