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Assume that the ciphertext C is computed from the plaintext P by C= P βŠ• K1 βŠ• K2 , where K1 and K2 are the encryption key and βŠ• denotes the bitwise Xor operation. Also, we know that the ciphertext of P=5 is C=12. What is the encryption key?
a) 9
b) 10
c) 3
d) 0

Respuesta :

tonb

Answer:

K1 βŠ• K2 = 9

Explanation:

Since 5 βŠ• K = 12, K must be 5 βŠ• 12 = 9.

But there are supposedly two encryptionkeys, we cannot know their individual value, only that K1 βŠ• K2 = 9.

That makes this a bit weird question.

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