Assume that the ciphertext C is computed from the plaintext P by C = P ⊕ K1 ⊕ K2, where K1 and K2 are the encryption key and ⊕ 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

Question

Evelin Chen

Computers & Technology

29 February, 04:12

Assume that the ciphertext C is computed from the plaintext P by C = P ⊕ K1 ⊕ K2, where K1 and K2 are the encryption key and ⊕ 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

+1

Answers (1)

Know the Answer?

Gloria Harper · Answer 1

K1 ⊕ K2 = 9

Explanation:

Since 5 ⊕ K = 12, K must be 5 ⊕ 12 = 9.

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

That makes this a bit weird question.

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

Assume that the ciphertext C is computed from the plaintext P by C = P ⊕ K1 ⊕ K2, where K1 and K2 are the encryption key and ⊕ 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