Computers and Technology, 10.09.2021 18:10, tsupreme

A Vigenère cipher uses a sequence of "shift-by-n" simple substitutions, where the shifts are indexed using a keyword, with "A" representing a shift-by-0, "B" representing a shift-by-l, etc. For example, if the keyword is "DOG," then the first letter is encrypted using a simple substitution with a shift-by-3, the second letter is encrypted using a shift-by-14, the third letter is encrypted using a shift-by-6, and the pattern is repeated—the fourth letter is encrypted using a shift-by-3, the fifth letter is encrypted using a shift-by-14, and so on. Cryptanalyze the following ciphertext, i. e., determine the plaintext and the key. CTMYR DOIBS RESRR RIJYR EBYLD IYMLC CYQXS RRMLQ FSDXF OWFKT CYJRR IQZSM X

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A Vigenère cipher uses a sequence of "shift-by-n" simple substitutions, where the shifts are indexed...