CTF, Wargame,

#PoliCTF 2012: “Este cifrado no es indescifrable”

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This entry was a flash challenge in the PoliCTF event. The cipher was [ Vigènere (es) |  Vigènere (en) ] and the key SIXTEENTHCENTURYCRYPTO.

1. Open Cryptool and analyze Histogram, Frequency and set in text options the alphabet to use. (A-Z). Don’t identify yet? :-)

 
YWLWIZRGPPKYHHUMPRJAHKEMCBVWGMVCTBEIXGBVDDKHZQPBRXRKYWTGBIEGFFJXDSEIKRSJLHBCTCKYTGCKCIASUWJYSVGLVHIIXLPBCPPDNHAVB-MLIFXJWVVMSFDVYCUTAATFTVXUXATEAJOZJKKWDYFWXBMMXVHUKIACIPRJVKPLAMKETWEARINSXXVLRKERWXGHQOBXSSVVOQRFIIYVZMCMVWZBUCXUHZGMZIIIRCERTOSFBPHJXUXWCWGNMLYNCWPLGGKFTXIQPPVLFHGVMPVQSXOLPLKXLRXUFSSLIDCCNDJEPDWLWCWGKBIKYXUTCNVZGTHAWKHJEABJGLBECUYAZRWHIYPQPIGBNSFQNKEKFKJLDOSEJBKXLR5MOCHNRNYYVZQHTRDGKHPSAZLTVRFYDZGICSUMLIHBRKFHTGXVFYFSVFDDNFVIFECPVOLUXBLCKBQNLPGRZISXEPVMANIPAUKRJVPTTFWWCVSYELLVLBLYNFQUMCHHOIKMYWGHZRINDCJSUGCRMSNMKGSABKKGVFTLVZGZLVLVGCQXHMAMVVIYXJYMPVQPGREMKPMXUZBPWJBFCQQFLQXCFBEXMVJTFYLLUYTYWJCLAWDMQAIXENUELRHHDYASCJLSVQKEMIHHMESAOYIQCKGDGKGZALAMYEHNANRMICVRGCMVWQOISARKDQVQLIWDGIRWXAWIKLXSZXHPMAZUEBHFPIACKMTASAVESNMFMYERJVCCNBUQXMMSAHMVVHMBRLFKFTMFMBEBWXUXYGMFLIDCVYGCZHWZOBFPLPYQRTPCKFVYGHVCMVQKCMFGAVLRKYTPWVJIROFLFGNYFMPEIVGNFJGIYCVSSVAHTTEXZUMBGUEBYYCGXCFKBRSYUTKVLRYLVCFFKIHCTRBVXXBMOKRXTHUQRVYZTGQWRLEASBAASHGINFCMCRXBKWOLERQLFUXRFMFDULPKXWDTXGGIPHLTGVGAPMWIADGTGZJBXCNGKUSYBWZRKEENHIJARUQMFLPQRUHQUGFKFXLVSXMXRAUHZVSOEUDCYVJAVSJBXBRPLMOGVRTLVRJFQTFCJMOXWTBGZKFYXNYYPFRWXFKIKWXLRRDKPYUYYCNUYRVCMVQTFPRUBVETTCERTLRWUSLWIWMJLHBTIYHIBGPXDDKHZMDNMPGRFQYAXYUMPCWAHCCQKMSEZBYTSEBEEMYNFNRCMLFWMXVDUQALHONCTVYUKOALTASABNSFRGUYNYTKCGKCJLFLIEFXAJIEXQVPGRKNKWSLLYTVBUSGQFPBZAJTMCLDAZBWXSPHYTYCMSFSTICPLCFIKWVSORVWSSRILPEFKBHBKMKLIJRTYISGMBVZGJRDYMGCXGHMARVWVCTHZAAFSINFFMAMSXUXUQAUBAYAJRLRXZDWOTHEZLBVPRKBVNTFKXLSVGLNSVQXYJICKIDGUVBNHIHMXVIEAWHNPUXXVKCEBTWWFZBMYVAPHUCBNLJGNVLIHPWLFXRXPHUUIAMFRQVEGVAHAALNKLGMVGRQMBRRUZJTGQWTXLXRVZOVMQXMKPQPCSMVWWIWFEVELAXBKYDGPURWBGUWRGXVLHMYLNMCKFCJDDKUGBQXRQBKLVLNGZFSTYSCWFWLVXEVFTNQETKYRREZRXSSFEFLLIQMVGQOXXKFGWGUMVGNKHZIZULTJBKYMCTZLDNFEMJHVCUBZJSCXQRQVFPTFWFLQAIABKSFXUTNWYKILTLGBCPMMGRTUFJEXYUMORPTFCJMQAERJHYFWGAYPYTVNTKGHMZMMZRLZQMSRILTGJCTGBGBEBRKVYAJIPKCDCUFDIAWKOLOIVAFLPXEXGRGPLLZGCOVQHCSHMOGRVPILJFJSVZSKBVHYEYEVYXUXZZDVYMUGCNMJUIVGHWCWFNHDYTBCSUILQCRSYFXLYLNMCJCGZDNHIXMBEEWVYLGPNGXZDAFSLHIDLPXIONLPUIRDNYCPZYHDMGCQHWXNGKDIFBXVKGFLTRSSZCKSQGHUKKUMILRUZBTMVWOXMIWBYWCVYBUDCPKYCWHGOBMLIEPLULNEFXGXVRWXASNFYXLBYUQZRFVVPVYYILVSTIGIZRKLXIEUYWMTXMIMVWSBRMWJXHNPYHPVQQLLSVFQXQH

2. Automatic Vigènere Decipher of the given text:

 
Results in:
GOODEVENINGLONDONALLOWMEFIRSTTOAPOLOGIZEFORTHISINTERRUPTIONIDOLIKEMANYOFYOUAPPRECIATETHECOMFORTSOFEVERYDAYROUTINE-THESECURITYOFTHEFAMILIARTHETRANQUILITYOFREPETITIONIENJOYTHEMASMUCHASANYBLOKEBUTINTHESPIRITOFCOMMEMORATIONTHEREBYTHOSEIMPORTANTEVENTSOFTHEPASTUSUALLYASSOCIATEDWITHSOMEONESDEATHORTHEENDOFSOMEAWFULBLOODYSTRUGGLEACELEBRATIONOFANICEHOLIDAYITHOUGHTWECOULDMARKTHISNOVEMBERTHE5THADAYTHATISSADLYNOLONGERREMEMBEREDBYTAKINGSOMETIMEOUTOFOURDAILYLIVESTOSITDOWNANDHAVEALITTLECHATTHEREAREOFCOURSETHOSEWHODONOTWANTUSTOSPEAKISUSPECTEVENNOWORDERSAREBEINGSHOUTEDINTOTELEPHONESANDMENWITHGUNSWILLSOONBEONTHEIRWAYWHYBECAUSEWHILETHETRUNCHEONMAYBEUSEDINLIEUOFCONVERSATIONWORDSWILLALWAYSRETAINTHEIRPOWERWORDSOFFERTHEMEANSTOMEANINGANDFORTHOSEWHOWILLLISTENTHEENUNCIATIONOFTRUTHANDTHETRUTHISTHEREISSOMETHINGTERRIBLYWRONGWITHTHISCOUNTRYISNTTHERECRUELTYANDINJUSTICEINTOLERANCEANDOPPRESSIONANDWHEREONCEYOUHADTHEFREEDOMTOOBJECTTOTHINKANDSPEAKASYOUSAWFITYOUNOWHAVECENSORSANDSYSTEMSOFSURVEILLANCECOERCINGYOURCONFORMITYANDSOLICITINGYOURSUBMISSIONHOWDIDTHISHAPPENWHOSTOBLAMEWELLCERTAINLYTHEREARETHOSEMORERESPONSIBLETHANOTHERSANDTHEYWILLBEHELDACCOUNTABLEBUTAGAINTRUTHBETOLDIFYOURELOOKINGFORTHEGUILTYYOUNEEDONLYLOOKINTOAMIRRORIKNOWWHYYOUDIDITIKNOWYOUWEREAFRAIDWHOWOULDNTBEWARTERRORDISEASETHEREWEREAMYRIADOFPROBLEMSWHICHCONSPIREDTOCORRUPTYOURREASONANDROBYOUOFYOURCOMMONSENSEFEARGOTTHEBESTOFYOUANDINYOURPANICYOUTURNEDTOTHENOWHIGHCHANCELLORADAMSUTLERHEPROMISEDYOUORDERHEPROMISEDYOUPEACEANDALLHEDEMANDEDINRETURNWASYOURSILENTOBEDIENTCONSENTLASTNIGHTISOUGHTTOENDTHATSILENCELASTNIGHTIDESTROYEDTHEOLDBAILEYTOREMINDTHISCOUNTRYOFWHATITHASFORGOTTENMORETHANFOURHUNDREDYEARSAGOAGREATCITIZENWISHEDTOEMBEDTHEFIFTHOFNOVEMBERFOREVERINOURMEMORYHISHOPEWASTOREMINDTHEWORLDTHATFAIRNESSJUSTICEANDFREEDOMAREMORETHANWORDSTHEYAREPERSPECTIVESSOIFYOUVESEENNOTHINGIFTHECRIMESOFTHISGOVERNMENTREMAINUNKNOWNTOYOUTHENIWOULDSUGGESTYOUALLOWTHEFIFTHOFNOVEMBERTOPASSUNMARKEDBUTIFYOUSEEWHATISEEIFYOUFEELASIFEELANDIFYOUWOULDSEEKASISEEKTHENIASKYOUTOSTANDBESIDEMEONEYEARFROMTONIGHTOUTSIDETHEGATESOFPARLIAMENTANDTOGETHERWESHALLGIVETHEMAFIFTHOFNOVEMBERTHATSHALLNEVEREVERBEFORGOT<strong>THEKEYISWEALLLOVESOU</strong>

NDCRYPTO

Token: WEALLLOVESOUNDCRYPTO

Thanks to the students from Politecnico di Milano for organizating this amazing and hard event.The level was, at least for me, very hard. Next year, less watch films and stego challs :P

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