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sample_quiz2_solution

sample_quiz2_solution - Math 187 Prof Garsia(typed by Alex...

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Math 187 Prof. Garsia (typed by Alex Brik) 04-13-2010 SAMPLE QUIZ 2 solution. 1. Decrypt the following F G A A F G V A A X G X F A V F V A F G F F G D D F A F F F X A X A G A A A V A A F X F X A G F A A D V A X G A D G A A Knowing that it was encrypted using the ADFGVX encipherment scheme and the keys SUMMER 7 2 4 6 5 9 1 8 10 3 Solution : ADFGVX key is 6 ° 6 matrix. We will get this matrix by writing °rst the key into the matrix - skipping characters already in the matrix and writing from left to right and from top to bottom. Once SUMMER is written we will then write the rest of the alphabet (skipping already written letters) and then digits 0-9. A D F G V X A S U M E R A D B C D F G H F I J K L N O G P Q T V W X V Y Z 0 1 2 3 X 4 5 6 7 8 9 Now the ciphertext is to be arranged into the column so that the number of the columns is the size of the permutation - 10 in this case. Since there are 60 characters in the ciphertext, we will write them into 10 columns of 6 characters each. We will °rst write the permutation
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  • Spring '10
  • MATH187
  • Math, Prime number, FGAAFG VAAXGX FAVFVA, FGFFGD DFAFFF XAXAGA, AAVAAF XFXAGF AADVAX, ADFGVX encipherment scheme, AVFXDAFXGF AAGAFAGFAA VAFXADAXDV

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