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中国大学MOOC答案
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The security of the encryption method depends on the encryption system, regardless of the length of the key and the amount of computation required to break the ciphertext.
The security of the encryption method depends on the encryption system, regardless of the length of the key and the amount of computation required to break the ciphertext.
中国大学MOOC答案
数据帝
2024-04-09
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Digital signature can prevent the denial by sender and the forgery by receiver.
As far as the computing power of current computer equipment is concerned, the data encryption standard DES cannot resist exhaustive search attacks on keys because the DES key is short.
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Generally speaking, the higher the sound quality is required, the higher the quantization level and the lower the sampling frequency is.
The higher the sampling frequency, the closer the discrete digitized sound wave is to its original waveform.
Audio files in WAV format do not use compression algorithm, so they have good sound restorability, strong stereoscopic impression and relatively large file capacity.
MPEG video compression standards include MPEG-1, MPEG-2, MPEG-4, MPEG-7 and MPEG-21.
数字电路中晶体管大多工作于( )。
在正逻辑条件下,如图所示逻辑电路为 ( ) 。
. 逻辑图和输入
A
、
B
的波形如图所示,试分析
t
1 瞬间输出
F
为 ( )。
图示逻辑电路的逻辑式为 ( )。
已知一门电路的输入和对应的输出波形如图所示,分析可知它是( )电路。
编码器的逻辑功能是( )。
译码器的逻辑功能是( )。