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Pick all the descriptions of active attacks. (Marks may be deducted for wrong ch...

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Pick all the descriptions of active attacks. (Marks may be deducted for wrong choices.)

Oscar recorded a message Alice sent to Bob yesterday and sent it again today.

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Oscar reads all the emails Alice sends to Bob.

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Oscar intercepted lots of ciphertext and tried to perform a frequency analysis to find the plaintext.

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Oscar sent a message to Bob but signed himself as Alice.

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