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Polyalphabetic Ciphers   Suppose the following ciphertext was encrypted using Vignenere cipher with key size equal to...

Polyalphabetic Ciphers  

Suppose the following ciphertext was encrypted using Vignenere cipher with key size equal to 2. Try to find the two letters that were used in the encryption.

SVSMHSCXGROFSLSOBDVOICIKZWSMVKBSGWPIKRWMVWCNSBBBSZFOGOBDODWFSNSWCMFKQIV KGYDOFKHOROZOQDWYBCAKMPWVZYTPWMSCWXHRSVSQWCZKHEFOGYAOHSAOGSBDVOSHSMID WFSKBNXERSQSOBMKBNTYFBSQWYBKZKBNZYQKZQCFSBBWSXHDVSGZFYQOGCWCOVGYICSNWXAK BICDVOFZFSJKHOOXRLICWXSCGYFQOXWJODWYBCTBCWQVILGDCFCVIXHKFIOCGYQSODWYBCOXR MCBDYFKHSCXGDVOIXWFSBGKZEGOCPSVSMHSCXGKGKHYCVTYFCSVSMHSBQFODBSCSXHKHSJOGSB WCNSBBBSZFOGOBDODWFSNSWCMFKQSSCWCWXQYBDFKGDKSHRHRSZFKQDWMSSBDVOROAYQB ODWMOBQRSDMZSKBMWOBDODVOBCKRSBSDVOSVSMHSCXGGSBSXCDICSNKOFOQYBCWNSBSNO XCVWQOBQRWMWXGDWDIDWYBKBNAYGDDYZSHSQKZYTPWMSCKOFOTSZVSNICWXUCCBHSHSCX OVGYYXCGBKGKZVCDAOBDPIKRWMVYTPWMSRCVROFCKOFOQRCCSXPIZYH

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Answer #1

the 2 letters used in Encryption are "O K"

The key can be found by dividing text in groups of 2 and then finding the frequency of alphabets appearing in the text.

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