How to be solved Vigenere cipher, dont know key?

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C#

How can decrypt this Turkish text : ŞAİGÖNHYÖSCIUAİGÖİOZDNCI
key length is 4. don't know key text

Posted 8-Jan-14 23:19pm

afus

Updated 8-Jan-14 23:23pm

v2

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Richard MacCutchan 9-Jan-14 5:46am

If you do not know the key then you cannot decrypt it.

Manfred Rudolf Bihy 9-Jan-14 7:13am

No, that's not quite the truth. Given that the text is not too short and the length of the key is not too big, there are statistical means to break the code: Vigenére Cipher Cryptanalysis.

Cheers!

Richard MacCutchan 9-Jan-14 7:19am

True, but I suspect that is still beyond the skills of the average poster here in QA.

Manfred Rudolf Bihy 9-Jan-14 7:23am

Agreed!

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Yvan Rodrigues · Answer 1 · 2014-01-09T14:09:00

Solution 1

It says Mostly harmless. The key is 0042.

Posted 9-Jan-14 14:09pm

Yvan Rodrigues

v2