Quote:

The lower-case cipher block will only be used if lower-case characters are present in the plain, crypto, or cipher text.




What is "crypto"? Are you referring to the "Keyword?

Code:

Keyword: RELAT IONSR ELATI ONSRE LATIO NSREL
Plaintext: TOBEO RNOTT OBETH ATIST HEQUE STION
Ciphertext: KSMEH ZBBLK SMEMP OGAJX SEJCS FLZSY

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