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Estimate the possible key length of the cipher text “TIGYXKLMPOUMEFRTIGBVTNJPGEGCL” generated by Vigenere Cipher, using Kasiski...

Estimate the possible key length of the cipher text “TIGYXKLMPOUMEFRTIGBVTNJPGEGCL” generated by Vigenere Cipher, using Kasiski Test.

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Answer #1

The given cipher text is: TIGYXKLMPOUMEFRTIGBVTNJPGEGCL

In this cipher text the trigrams (three characters repeating at a certain distance) present is "TIG".

And there are no bigrams (two characters repeating at a certain distance) present in the given cipher text.

The first occurrence of "TIG" is at position 1.

And the next occurrence is at position 16.

That is the occurrence is 15 positions apart.

Now, the factors of 15 apart from 1 are: 3, 5, 15

Therefore, by Kasiski Test, the estimated the possible key length of the cipher text "TIGYXKLMPOUMEFRTIGBVTNJPGEGCL” generated by Vigenere Cipher, may be either 3, 5 or 15.

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