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CIS 3362 Homework #1 Monoalphabetic Ciphers Due: Friday, 9/10/2010 Note: This is a group assignment. Each pair of students should turn in one write-up in class on the due date. Both students' names should clearly be at the top of the front page of the assignment. Students may also turn in the assignment by themselves if they do not wish to have a partner. Decode the following ciphertexts. Please use the the two tools that I have provided off the course webpage and any tools you may create yourself, and in your write-up, describe the steps you took and why you took them in decrypting the ciphertext. At the end of your description, reveal the full matching plaintext. 1) (shift) mubsecujeshofjesbqiixefujxyicuiiqwumqidjiexqhtjerhuqa 2) (affine) ijchedjckmteckjgrlerdjerecktmregkmtumwsgtdvwkddrughhmxdjefmkkczh eoeuklmtdxmrqeddmircdelmitijgddjeetsrufdcmtxwtsdcmtigk 3) (substitution) klpxulkccufpoikrukqksbfqlusujbfcdhbbibdlujkqksjhbsuqbpibbtqlufgt euibdqlpqibbtksvkqlkfbfubdpobvuibdqvbpfcqlusgtbdkqsdkisqqvbckakq
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Unformatted text preview: sungphsqluqlkicfupiqlksibbtqluiukspfbewujqqlpqiusutehuspskfuvpxu gfcuifupqlqlksbewujqybgvkhhdkfcpfufxuhbouvkqlpoikrukdybgauqqlkso ikruohupsuutpkhpigosblujpfquhhqluiusqbdqlujhpssfbqqbhbbzdbikqpsq lkstkalqcksigoqqluouisbfvlbvbizskfqlksbddkju 4) Encrypt the following message below using the affine cipher function, f(x) = (5x + 14) % 26. WEHAVEFINALLYFINISHEDTHEFIRSTWEEKOFCLASS 5) Consider a language with an alphabet size of 48. How many possible affine cipher keys could there be for this language? 6) Given that the encryption function for an affine cipher (in Spanish, with 30 alphabet characters) is f(x) = (13x + 4) % 30, determine the corresponding decryption function. Please show all of your work. 7) You are attempting to break an affine cipher. You believe that the ciphertext A maps to the plaintext letter e and that the ciphertext V maps to the plaintext t. Determine the encryption function used based on these two pieces of information....
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This note was uploaded on 07/13/2011 for the course CIS 3362 taught by Professor Staff during the Fall '08 term at University of Central Florida.

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