Question: Suppose I use the simple binary substitution cipher mentioned in the last problem to encrypt a secret message, represented in binary ASCII representation. As a

Suppose I use the simple binary substitution cipher mentioned in the last problem to encrypt a secret message, represented in binary ASCII representation. As a result of encryption, I

'

m left with nothing but a string of straight

0'

.

Which of the following must be true?

Group of answer choices

The only letter in my secret message is the lowercase

'

' .

The secret message was itself a set of straight

0'

.

The keyphrase was itself a sequence of straight

0'

The plaintext is identical to the keyphrase I used.

The fact that we got straight

0'

s doesn't tell us any of these things.

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