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The affine cipher E is given by E(x) 17x 3 (mod 26). The conversion table for letters and numbers is shown below. A B C
The affine cipher E is given by E(x) 17x 3 (mod 26).
The conversion table for letters and numbers is shown below.
A B C D E F G H I J K L M
0 1 2 3 4 5 6 7 8 9 10 11 12
N O P Q R S T U V W X Y Z
13 14 15 16 17 18 19 20 21 22 23 24 25
(i) Show that 3 is a multiplicative inverse of 17 modulo 26.
(ii) Suppose that you receive the enciphered message 8, 23, 10, 11.
Decipher the message and deduce the word that was sent.
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