InterviewSolution
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InterviewSolution
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If the block size is ‘s’, how many affine transformations are possible ?(a) 2^s (2^s-1)(2^s-1)(2^s-1^2)………(2^s-1^(s-1))(b) 2^s (2^s-1)(2^s-2)(2^s-2^2)………(2^s-2^(s-2))(c) 2^ss (2^s-1)(2^s-2)(2^s-2^2)………(2^s-2^(s-1))(d) 2^s (2^s-1)(2^s-2)(2^s-2^2)………(2^s-2^(s-3))This question was posed to me in final exam.My doubt stems from Block Cipher Systems in portion Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security |
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Answer» CORRECT choice is (c) 2^ss (2^s-1)(2^s-2)(2^s-2^2)………(2^s-2^(s-1)) To EXPLAIN: 2^s (2^s-1)(2^s-2)(2^s-2^2)………(2^s-2^(s-1)) is the MAXIMUM number of affine transformations possible for a BLOCK size ‘s’ matrix. |
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