How do I decode the following text using vigenere cipher? \"EV KLFGZXSH KMLTWDDU

Question

How do I decode the following text using vigenere cipher?

"EV KLFGZXSH KMLTWDDUAZWNZTBERSSIXYZWGKTUEHPNZEHPOXTSWZBXVNDUTU FXGTL NXYWYXALJIZSWNGXLPZKUVYUVNGNNGJ PZFVDNKXCLOIYUTYAFYXZEMHXKWGLGAJJUVVIVOLHPOIFHHFBTY TZKZWGMKAIVNAVJYUEHGOHZGO X GXRAGYEZBEZWNVJKWZISINKVCGETUHYXINAJAFWQGXTSSH AZJZXXSSPPFCKGPNZGYAZCVHHRSSWKYMAIHKULVWHLXHGFMMJDFVSZUYNXTWHOLGEZUAZWOHYLXYCUSAFNGG UUKVWHSSHJDUCUKBHSWNGXLPZGFSTAGHKGPNZKLWYX LIKMSHNKULOAXZYVNKULLNSZWGZUGHAPGNAVJGFDEWYZVANKULOAULX EIVDGXJPTUZKMSLCFCEWNUPXTATNKGETUAUPKAXYWLVV KXCRHPOIFGXRAGYEZBEZWGHWGBGMLLNFXGTL NAUCFNXJDTIDVCDUJLM CJLWZBXZAFMGSQZCGUOFNGGYKUVVJZCFAXRFQGXJVH AJULOAXZSLTOMLGET GYIGNAVJFN LKXZLPZGFDEWYZVANKUKJDKGXZWZBT WVLGBXHFQGZGHFVPFWXGYXICLJFZNLJFQA DFOFSESCLL FXGTL NAUCFJGCAXUTUWKRTTLRZSPOFN LWUHXGPOGXGLGYSIQZULOAYZSZZNZELOFVJLWSIJLWJCYMEIOD WZISPIVFXTATNS DGHS DKUULOZULOAULX EIVDSUFWJLXQVUSAFWM WIIEWQZVLPKTVDSUFMXJQXZSTAIBTUEYGK"

Do the analysis on repeating patterns in the cipher text and do factorizing to guess the possible size of keys.

Do the 1-gram character analysis for all groups, and then guess the possible key characters for the groups.

Explanation / Answer

Answer :

After Decoding The Above Text Looks like :

mp etknuqap dstmekbcihqhhyizkaabdgsenibcmbjvelciwfmyesjetvlcno ncnoe vfrcgqishqhaqhocsksscoecovnlvor jtnakidfkeuqrcawingrtmrosdeoemicrbtdqdifpuvdyppyhbr bgiheogeincitdrramaovfhow r afwhbrmhukhpvchsehcmqsrqvommaprfplirizqyleolap tfrsfeqaxxzwslwisogtfkopopaaeesufpcdctocpefoenuudxnazungvqzeawsemhcut
etotefgvaatnueo ccepemznarlnicdjoqevorfxenalbiznszxuxstesr tnrhlpvdathiexgdveotqunseosaoaiweviddanilrrhdttsntvyctf ycdinscxbnfsfasankmqhcueotbvdmmmchsxsirseqcq dfkknxhqmefziasmeizseoacouotjtvnrabq uvnkngdrwbpbdklodtr jeeehudhtnteayhwactmizogdadorganiflzyleeop icathiexatbigtllo zgqztiorml tsftfxenawmerfdtvrssrleafeduub eoroufodyohabnawapfordqvtqdhvtdzyf kahnaxyket mvobt huchmezkiqabnerpbbtltauvag tennfzxvefotasanxuntwtehlhglhmtizdosrlqrecrvgtcqwl qtqxwdonfmgbga kepa leocqvuntwtatq mptlaczqrqelocatlef epgmeytpturoolanluqrxvhabucjybzros

Based on repetitions in the encrypted text, the most probable key length is 19 characters.

Here is a list of the most probable keys based on frequency analysis of the letters in the cipher:

Key #1: sggsvtfhsshushstcss
Key #2: sggsvtfhsshushstcsg
Key #3: sggsvtfhsshushstcgs
Key #4: sggsvtfhsshushstcgg
Key #5: sggsvtfhsshushstnss
Key #6: sggsvtfhsshushstnsg
Key #7: sggsvtfhsshushstngs
Key #8: sggsvtfhsshushstngg
Key #9: sggsvtfhsshushsvcss
Key #10: sggsvtfhsshushsvcsg
Key #11: sggsvtfhsshushsvcgs
Key #12: sggsvtfhsshushsvcgg
Key #13: sggsvtfhsshushsvnss
Key #14: sggsvtfhsshushsvnsg
Key #15: sggsvtfhsshushsvngs
Key #16: sggsvtfhsshushsvngg
Key #17: sggsvtfhsshushftcss
Key #18: sggsvtfhsshushftcsg
Key #19: sggsvtfhsshushftcgs
Key #20: sggsvtfhsshushftcgg
Key #21: sggsvtfhsshushftnss
Key #22: sggsvtfhsshushftnsg
Key #23: sggsvtfhsshushftngs
Key #24: sggsvtfhsshushftngg
Key #25: sggsvtfhsshushfvcss

etc..................

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