单选题Regarding constructing a good encryption algorithm， what does creating an avalanche effect indicate？（）AAltering the key length causes the ciphertext to be completely differentBChanging only a few bits of a ciphertext message causes the plain text to be completely differentCAltering the key length causes the plain text to be completely differentDChanging only a few bits of a plain-text message causes the ciphertext to be completely different
单选题
Regarding constructing a good encryption algorithm， what does creating an avalanche effect indicate？（）
A
Altering the key length causes the ciphertext to be completely different
B
Changing only a few bits of a ciphertext message causes the plain text to be completely different
C
Altering the key length causes the plain text to be completely different
D
Changing only a few bits of a plain-text message causes the ciphertext to be completely different
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