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Suppose you intercepted 8 bits of ciphertext: . Suppose you know that...
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Suppose you intercepted 8 bits of ciphertext: .
Suppose you know that this ciphertext is obtained by encrypting some plaintext using a stream cipher, and suppose you know that the keystream has period 4. Suppose further that you managed to obtain some bits of the plaintext:
What can you say about the keystream?