Viewing Single Post From: Double cipher challenge

Viewing Single Post From: Double cipher challenge
Revelation	Aug 12 2007, 08:09 PM
Administrator Posts: 386 Group: Admin Member #1 Joined: August 23, 2005	Quote: Now think about what happens, if you encrypt with a simple substitution, then again with Vigenere - the result is the same as if you'd encrypted with Vigenere alone. The keyword for this equivalent Vigenere is different than what you used in the original, but that doesn't matter to the cryptanalyst, who doesn't know the keyword anyway. I don't think this is right, since a substitution is not a shift. You WILL get different results if the ciphertext is longer than than key, which is the case with Vigenère. So I think we should look for a substitution and a Vigenère. The order doensn't matter. Quote: Dont know if this helps anyone! Perhaps I should have placed this in the challenge section! You ask, we split edit2: this cipher has got a name, if it is what I think it is. It is a vigenere with mixed alphabeths. I made a challenge like this for the forum a while ago.
	RRRREJMEEEEEPVKLWENFNVJKEEEEEAOLKAFKLXCFZAASDJXZTTTTTTTLSIOWJXMOKLAFJNNKFNXN RAGRBAQEMHIGDJVDSEOXVIYCELFHWLELJFIENXLRATALSJFSLCYTKLASJDKMHGOVOKAJDNMNUITN RRRRLJVEEEEECLYVYHNVPFTAEEEEEMWLMEIRNGLARWJAKJDFLWNTIERJMIPQWOTZEOCXKNUBNXCN RJIRPOWEANFUSNCZVDVZNMSFEKLOEPZLDKDJWSAAAAAAAOERHJCTNCKFRIMVKSOFOMKMANREWNBN RZUDRGXEEEEENFQIDVLQNCKNEEEEEDGLLLLLLAWIOSNCDARLODMTOEJXMILDFJROTKJSDNLVCZNN

Double cipher challenge · Challenges