Cracking the Vigenere Cipher, Computer Network Security

The following message was enciphered with a Vigenère cipher.

aikiaawgfspxeppvjabjnivulfznzvkrlidamsmyamlvskniyffdpbwtnxsvvbtnamvltsefoeycztkomylmerkwrs

deusjgecmzkwvnreeypnnosdahjepkujejwttymoeatnvtipafsvgjnvtrlkauiwertshdtasqmfaooltxjiehrzmcpcosdiz

szukzezpeoehevrrajlsarlmzjimayddscnyzsyahnczucvqnkptywmedpbllwqedpzliuagieysaljtismaeowzllghpiifijt

padeegedszfgrtsuikhnyrucqhbpcaugqnymeujscppdrxxrrehzkarevauemgttnxvvvnvdiazvnrwyaprdlneqjbxsaj

gzrrnodwetrziearwucydsxpharvnmrwdolllnmatffweeeuifxbtsegjiziprcwetuphrkwreytywqghconfmaaetywhreae

evavtsbfllzaycywwgecccmffaydeganrdeespseltljmagtnkzivrqiikxsofrdsxphpsffxueqiolyeewijlwbpprystfiesegw

hrarzkighltkzivrqiikxrvprkjmctztywizicakwwpoxejomghehvewgiwlcgsxiygwgvghpiixmesepfargszfkzifelsffwniyt

jsvrtseffpltpadarghppiwqveclvskhejeklsteeowxxuexaiceadehvjinrppcwrgyzfjlegslrfmrqsfgxwwgiyggjszoeeulin

mdwygpbsptywmeftrjlxurpexsqrslrvvsbmpdfxgbucsvllryweuskniysktsghnikqeadfnzliqsnoiartthitwmaelcyyeze

ehvzszeoewwegtztygwrthocsxrrzbzfznnaeikmrgzackjbrfnzliqmfskzeiemevftnreitmpnrwyxspyiygrfhghptnwrgy

oewwegbjwzyeaaeskeeeydijhvrctsvdcghpsfjxbfcejmpgtsepzeieeornsvdtfkzilrptfymieehvewrlgejshrcpnkuln

nnefxwgajieyycacsvfeywprvaqcrpsjazrllsklmzezukarntheelcjiyakdmiecpfgpjiehcmonsaougpfktaevwnneits

dbrwajuseiygkzivrqiikxtolljxsetsetdyotsepoieelljgeespnrdwsicskysnldowllrspajgrzodtcqqvsqiiartaeoewiad

ehvyyanprjzeiemevfwbltdrlxueztywvrnoowllrptttzxurpetdinndhvwxfiyaigazavejaxghpccmffbpskkxnretfswra

doeviseyszniyyqoiwmtheyvakutjerjwghpymwrrvprxgrrfzuiyezedwzllbuecffgrdtnxsxghpsksvgoqajwefoyiellrtz

puazvstoesrqielctivneeiwwgiygkgwretfcswgspajgrftzpjuseecszfxuenhretvoysyatrirhkqjvvpcrfxeofbcwxuexhv

jinfeeizeiiygjgqrsfctwwfarazfwgtsedsrphpskwvplfbjaxfbpeesauiwejarpeehvkigwzccmffllskeigiytywpraruvwzv

dpntwhoyehvxeptehrlwbuehretgoyscswgvtszlxbtsejwtnresnswntciglsuirhsmvlfzrrlabthoujejiytngxuofsrfhnno

ffmvghpiidefthiesanyltrjwrnlltsqrtheelcsigepweeslgfolrnoaefcjawlruifczrvvxuezncqkbawowllrglmvsvfeyaczei

eoodarntpdkzmfftxkmvriynfjxulznugrrvprjarpedoljgrbmcjhsetd


Show all your steps including:
? The Kasiski’s test
? Hypotheses of the probable period(s) and their assessment using index of coincidence calculations.
? Using correlation function<


a) (5pts) Perform a frequency analysis on the ciphertext and plot a figure that looks like the one shown below (this is slide 12 in CH02.pptx). How do both plots relate to one another?

b) (5pts) Kasiski’s test

Posted Date: 9/15/2012 11:57:02 PM | Location : United States







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