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decode a vigenere ciphertext without having the keytext

807607Nov 24 2006 — edited Nov 24 2006
hello,
I have to write a code that kann break a vigenere cypher:
I have a cyphertext :NIFJEHF
and i have to find the keytext to decrypt the cyphertext.
Can Anybody help me please or tell me how to proceed?
I already google but didn't find nothing helping me to program that.
Thank for your help
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Locked on Dec 22 2006
Added on Nov 24 2006
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