1. (i) This problem deals with the affine cipher with the key parameters a = 3, b =1. (a) Write down the last two digits

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1 I This Problem Deals With The Affine Cipher With The Key Parameters A 3 B 1 A Write Down The Last Two Digits 1 (22.42 KiB) Viewed 23 times

1. (i) This problem deals with the affine cipher with the key parameters a = 3, b =1. (a) Write down the last two digits of your ID in words. For example, if these two digits are 25, then your text is "twenty five". Encrypt the text. (b) Decrypt the following text: Z irmn gwzd hibdd (ii) We will use the same stream (s0..... 56) 0101100 as in Textbook3/Example 2.1. Let zo = = 0, I5 = 0, 16 = 1 and r₁=k, mod 2, i=1,2,3,4. Let the plaintext x=(0,.... 6). (a) Encrypt the plaintext x; (b) Check that the decryption of the ciphertext (yo..... y6) gives the original plaintext x.

М. - 1 мз =8 k:= M:+1 i - 1,2,3,4 k:8 ка: 7 ²/3 = 9 KZ 2