Question

Estimate the possible key length of the given ciphertext generated by Vigenere Cipher using Kasiski Test....

Estimate the possible key length of the given ciphertext generated by Vigenere Cipher using Kasiski Test.

Ciphertext:

HIBKA UQFLF SBQSX SKCFB YOAGP ALGTC RTYTL

DGBYO AGPAL OAKYB FBILY OYQTD ISVAI JJNNA

DXNLW NRQPF BVPWN IWAFB YAANR URTZE LYZLF

MEWHI BKAUQ FLALJ GTXRG VNIJP ZREQL KWZA

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Answer #1

There are repeated letter groups:

HIBKA UQFLF SBQSX SKCFB YOAGP ALGTC RTYTL
DGBYO AGPAL OAKYB FBILY OYQTD ISVAI JJNNA
DXNLW NRQPF BVPWN IWAFB YAANR URTZE LYZLF
MEWHI BKAUQ FLALJ GTXRG VNIJP ZREQL KWZA

The separation (start to start) between the two occurrences of HIBKAUQFL is

108 = 33 . 22   letters, and the separation between those of BYOAGPAL is 18 = 32 .2 letters.

Common divisors of these two numbers are 2,3,6,9, and 18, and so these are the most likely keyword lengths.

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