If a Vigenere cipher uses the keyword CATS, what is the key used and what is...

If a Vigenere cipher uses the keyword CATS, what is the key used and what is the ciphertext that corresponds to the plaintext CATSCANS

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Ans:

here we have,

keyword : CATS

plaintext: CATSCANS

Now, the keyword is repeated until it match the length of plaintext.

so, key is CATSCATS

Becuase, the length of the plaintext is 8, so, we made key with length of 8

Plaintext : C A T S C A N S

key : C A T S C A T S

Ciphertext : E A M K E A G K

Here we look for the character at a position where the plaintext character (row) and key character (column) is intersected.

Thefeore the Ciphertext is EAMKEAGK

venereology answered 1 year ago

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