Super-Encipherment using two affine transformations results in another affine transformation.(a) True(b) FalseI got this question in an online interview.The question is from Block Cipher Systems in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

Super-Encipherment using two affine transformations results in another

1.	Super-Encipherment using two affine transformations results in another affine transformation.(a) True(b) FalseI got this question in an online interview.The question is from Block Cipher Systems in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security
Answer» The correct CHOICE is (a) True For EXPLANATION I would say: f(g(m))=A_1 g(m)+c_1 f(g(m))=A_1 (A_2 m+c_2)+c_1 f(g(m))=A_1 A_2 m+A_1 c_2+c_1 f(x)=A_3 m+c_3 where A_3=A_1 A_2 c_3=A_1 c_2+c_1 This results in another affine TRANSFORMATION, and does not improve the security.

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