In affine block cipher systems if f(m)=Am + t, what is f(m1+m2+m3) ?(a) f(m1) + f(m2) + f(m3) + t(b) f(m1) + f(m2) + f(m3) +2t(c) f(m1) + f(m2) + f(m3)(d) 2(f(m1) + f(m2) + f(m3))The question was asked in quiz.My doubt is from Block Cipher Systems in division 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+m3) ?(a

1.	In affine block cipher systems if f(m)=Am + t, what is f(m1+m2+m3) ?(a) f(m1) + f(m2) + f(m3) + t(b) f(m1) + f(m2) + f(m3) +2t(c) f(m1) + f(m2) + f(m3)(d) 2(f(m1) + f(m2) + f(m3))The question was asked in quiz.My doubt is from Block Cipher Systems in division Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security
Answer» Correct answer is (c) f(m1) + f(m2) + f(m3) For explanation I WOULD SAY: 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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