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Help with decoding Vigener Cipher

# Help with decoding Vigener Cipher

Posted in the Cryptography Forum

Since: Sep 10

#1 Sep 18, 2010
I am stuyding at a college and the prof. has tasked us to break a vigener cipher. the only problem is we have not been shown an example on how to do so, i tried to learn it through the internet but have gotten confused. Can someone please help me decipher the below Vigenere Cipher, i need to find the key length and the actual Key:

SQMVWTEZKNEHMQLJUSENSCIPPGMBLC UMOUFORQSWULZCRXXTZRXNBOAEQXVY FHRPCLDAIMTEQDHBUZRQMPIEFGIBPF TRSOGPMQJDMLPUIATLDHIBIPOZTNSD ZHQKMJUMEUBOKRGQBXNDVCPETDPJTN UUMXVDBKIJTTZFSOBWGSIKVEUSLJUL YMSCTSMOIMGZDRLXSEUUICSTOJWWPC YZHNUZONYAULZZQXSZGRPXPVUMKPML ERMCILFZQAVOQKCBULYOIMBYPVEWUW AUIBNLVDWCZEARXAVENDJXSPMVEWUZ ZZQKMTZFRHNATHXQBEMLGDSEMHPNEZ RSLRTQMHLYSZBNVCJZZBLNBEQCSOGP MSYAFMKCMBPYAPRORZZXDSPPDJXSXQ CYWGTZHWQFOEDRCCPRNVNNJFHQNJYF NXDDNQIJUSUMKFPCXCWLBCODLJMQYZ HNVAMMHCILFRSUBXQKCJOOGMJJTSUN RJCWQSLJUOAFUKBCWZXVFLEHLJMENX XQFXIGCRJYFGMBXPMJTREZFXRNPAET NBNQGEEFUACIUJRTSXXQLEREFBJFGI CJXQ
Jeff Dege
#2 Sep 20, 2010

BTW - that isn't an ordinary Vig. There's a hint of periodicity at a keylength of six, but the IC at a shift of six is far too low, for a single 26-character alphabet.

United States

#3 Nov 14, 2011
If u want help u hve to show something
Horace

Tuen Mun, Hong Kong

#4 Jan 29, 2013
WATCHINGACOASTASITSLIPSBYTHESH IPISLIKETHINKINGABOUTANENIGMAT HEREITISBEFOREYOUSMILINGFROWNI NGINVITINGGRANDMEANINSIPIDORSA VAGEANDALWAYSMUTEWITHANDAIROFW HISPERINGCOMEANDFINDOUTTHISONE WASALMOSTFEATURELESSASIFSTILLI NTHEMAKINGWITHANASPECTOFMONOTO NOUSGRIMNESSTHEEDGEOFACOLOSSAL JUNGLESODARKGREENASTHEBEALMOST BLACKFRINGEDWITHWHITESURFRANST RAIGHTLIKEARULEDLINEFARFARAWAY ALONGABLUESEAWHOSEGLITTERWASBL URREDBYACREEPINGMISTTHESUNWASF IERCETHELANDSEEMEDTOGLISTENAND DRIPWITHSTEAUZEREANDTHEREGREYI SHWHITISHSPECKSSHOWEDUPCLUSTER EDINSIDETHEWHITESURFWITHAFLAGF LYINGABOVETHEMPERHAPSSETTLEMEN TSSOMECENTURIESOLDANDSTILLNOBI GGERTHANPINHEADSONTHEUNTOUCHED EXPANHHUBWRGYXHORAJAGEHEB

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