Let FF be a block cipher with nn-bit block length. Consider the message authentication code for 2n2n-bit messages defined by {\sf Mac}_k(m_1, m_2) = F_k(m_1 \oplus m_2)Mac k (m 1 ,m 2 )=F k (m 1 ⊕m 2 ). Which of the following gives a valid attack on this scheme?
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its is the formula used in chemistry
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