Posted: November 25th, 2015
Project Assignment
Project Assignment
40 points
Decipher each encrypted code use the method and parameters indicated. Please show or discuss all work in how you deciphered the message.
1. Use an Additive Cipher to decipher the following code: (13 points)
CSYWS VXSJW XEVXX LMROM RKERC XLMRK MWTSW WMFPI MJCSY LEZII RSYKL RIVZI
Solve the following equation to acquire the additive key.
2y2 + 3y = 44 Solve for Y. Your additive key will be the integer result.
(Show decipher table for first 13 letters)
Plaintext a b c d e f g h i j k l M
position 1 2 3 4 5 6 7 8 9 10 11 12 13
Additive Key:
Position of cipher text
Cipher text
2. Use a Multiplicative Cipher to decipher the message. C = 5P mod 26 (13 points)
GDDUW AIUQN AUDFA URCVPNUTAN EDCID UHFYX DCCYN AHAMG AIPYD BYIDU IMYKL DCIDU HFYXD CUVNG AHF
Please complete the tables below and decipher the above code.
Plaintext a b c d e f g h i j k l m
Position 1 2 3 4 5 6 7 8 9 10 11 12 13
Multiply by ____
Mod 26
Cipher text
Plaintext n o p q r s t u v w x y z
Position 14 15 16 17 18 19 20 21 22 23 24 25 26
Multiply by ____
Mod 26
Cipher text
Deciphered message:
3. Use a Permutation Cipher to decipher the message below. Useb=6 as your block length and 4,5,2,1,6,3 as your permutation sequence. Please decipher the code and show the first 2 inverse permutation blocks. (13 points)
PLEPEO DIIFTN EAAFSR TOEIFR IVROEG ERTOSH BEOFIR ROGNNW ANTGBH GRIEIN HGT
Block 1 1 2 3 4 5 6
Inverse Permutation
Letter
Block 2 1 2 3 4 5 6
Inverse Permutation
Letter
Deciphered message:
4. What series are these three quotes from? (1 point)
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