In affine block cipher systems if f(m)=Am + t, what is f(m1+m2) ?(a) f(m1) + f(m2) + t(b) f(m1) + f(m2) + 2t(c) f(m1) + t(d) f(m1) + f(m2)This question was addressed to me in an interview for job.The origin of the question is Block Cipher Systems in section Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

In affine block cipher systems if f(m)=Am + t, what is f(m1+m2) ?(a) f

1.	In affine block cipher systems if f(m)=Am + t, what is f(m1+m2) ?(a) f(m1) + f(m2) + t(b) f(m1) + f(m2) + 2t(c) f(m1) + t(d) f(m1) + f(m2)This question was addressed to me in an interview for job.The origin of the question is Block Cipher Systems in section Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security
Answer» Correct answer is (a) f(M1) + f(M2) + t The explanation: In generalf(∑(i=1 to n) m_i = ∑(i=1 to n) f(m_i) + tδ_n) where δ_n=0 if n is ODD and 1 if n is EVEN.

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