Cyber Security Question

Assignment: Cryptanalysis CSC 4575/5575 Due Date: Check iLearn Total points: 40 1. Decipher the following text produced by a Caesar cipher. Code to compute Correlation of Frequency for cryptanalysis. If you use brute force with exhaustive key search, you get HALF points. Must show your work in detail. [20] IT STY XYZRGQJ TAJW XTRJYMNSL GJMNSI DTZ (shows spaces in proper place) 2. The following was enciphered with a Vigenere cipher. Find the key and decipher it. Code to compute Index of Coincidence (IC). UPRCW IHSGY OXQJR IMXTW AXVEB DREGJ AFNIS EECAG SSBZR TVEZU RJCXT OGPCY OOACS EDBGF ZIFUB KVMZU FXCAD CAXGS FVNKM SGOCG FIOWN KSXTS ZNVIZ HUVME DSEZU LFMBL PIXWR MSPUS FJCCA IRMSR FINCZ CXSNI BXAHE LGXZC BESFG HLFIV ESYWO RPGBD SXUAR JUSAR GYWRS GSRZP MDNIH WAPRK HIDHU ZBKEQ NETEX ZGFUI FVRI You may work on part of it by hand (like which IC to choose). You may reuse work from question 1 here once you have found the period and split the alphabets accordingly. Must show your work in detail. [20] Deliverables in ilearn: (Screen shots of both program outputs) • • • Answer (decoded text). Source code. Any work done by hand. (picture or scan)

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