Posted: Wed Apr 18, 2007 10:03 pm
PS: Oh no! you guys beat me to it! darn it, I spent 3 hours on this! plus one hour editing this damn post ...I mean, Good job! grrr. Oh well, I'll still post it so you all can see why now my brain has turned to mush... go ahead, laugh at me Well, seems like I only got a little bit, and not sure what I had to do to get the whole thing.
I may be on to something. I was reading this article and was trying to understand and apply that technique on our cipher. It looks quite promising.
As I mentioned before, starting with Vvzcj! = Hurry! I got part of the key: obill. So I tried to use that (as the arrow suggests and just like the word 'THE' in the article example) on the previous cipher.
After a few tries, skipping one letter got me the best results (skipping 0, 2, or 3 letters gave me gibberish). The idea is to use the part of the key that was obtained as plain text, but offset a number of characters to the left.I'll place obill, or rather, "o Bill" against "c Qwde", matching the capitalization on the cipher. As I said I'm skipping one letter, that last 'f' (plain text and implied key marked with * below because we don't know them yet).
That new bit 'opost' didn't look as gibberish-y as the other attempts I made. Now I just have to pick a letter for the word Bill*.
The obvious one would be bills, so I tried that. The cipher letter 'f' which I had skipped, would decrypt to an 's' (to get Bills) if I use an 'n' on the key:See how the key now says "opostnobill"? the 'n' I got from guessing bills makes the word No for No Bills, which is a good sign.
Now I'll just repeat what I did before with obill, this time with opostn, or matching the cipher text spacing and capitalization, "o Post n".As said before, the plain text is english, and that N with the cipher text A (from Ac) implies another n as the key, giving us english once again in the key (nopostnobills).
But then there's gibberish before that. Let's complete that last letter to see the whole key:So the gibberish part is eveyje. This is exactly how the autokeyed vigenere works (which interestingly is the real cipher that Blaise de Vigenère invented since the normal vigenere we've been using all the time was invented 30 years before by Giovan Batista Belaso): instead of repeating the key over the length of the message, you append the plain text after the key and use that for the subsecuent shifts.
The other option is using "Billy" instead of "Bills":The key now is sveyje and the plain text is more obscure (and funny), but still interesting (Ho Billy? billy-ho?).
You can check both results by using this tool. Put "Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!" as the message and decrypt with either of the keys obtained (yveyje and sveyje). I think this is a very strong indication to focus on decrypting the rest with autokeyed vigenere.
I have no idea how to use 8404. I tried something similar with the other two ciphers (Sowehws Hipn - Aghfil Nxblq) and didn't get anything meaningful. I tried both keys as tiny pics and tiny urls, nothing. I'm not sure what "No Post No Bills" means, but it looks like some imperative for Maddy, or maybe the dropped-off armless person.
I tried my best to explain how I got this, and hope some of you understand it well enough to take it further. Right now I'm beat and need to eat. I'll get on chat after that and see what everyone thinks of it.
I may be on to something. I was reading this article and was trying to understand and apply that technique on our cipher. It looks quite promising.
As I mentioned before, starting with Vvzcj! = Hurry! I got part of the key: obill. So I tried to use that (as the arrow suggests and just like the word 'THE' in the article example) on the previous cipher.
After a few tries, skipping one letter got me the best results (skipping 0, 2, or 3 letters gave me gibberish). The idea is to use the part of the key that was obtained as plain text, but offset a number of characters to the left.
Code: Select all
cipher text: Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!
plain text: <---\ Hurry!
implied key: \--- obill
^^^^^
Code: Select all
cipher text: Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!
plain text: o Bill* <---\ Hurry!
implied key: o post* \--- obill
^ ^^^^
The obvious one would be bills, so I tried that. The cipher letter 'f' which I had skipped, would decrypt to an 's' (to get Bills) if I use an 'n' on the key:
Code: Select all
cipher text: Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!
plain text: o Bills <---\ Hurry!
implied key: o postn \--- obill
^
Now I'll just repeat what I did before with obill, this time with opostn, or matching the cipher text spacing and capitalization, "o Post n".
Code: Select all
cipher text: Lj Tmbx Ac Qwdef - 8404<-- Vvzcj! ETA: It's Tbmx you idiot!
plain text: o Post No Bills <---\ Hurry!
implied key: v eyje no postn \--- obill
^ ^^^^ ^
But then there's gibberish before that. Let's complete that last letter to see the whole key:
Code: Select all
cipher text: Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!
plain text: No Post No Bills <---\ Hurry!
implied key: ev eyje no postn \--- obill
^
The other option is using "Billy" instead of "Bills":
Code: Select all
cipher text: Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!
plain text: To Post Ho Billy <---\ Hurry!
implied key: sv eyje to posth \--- obill
^ ^ ^
You can check both results by using this tool. Put "Lj Tmbx Ac Qwdef - 8404<-- Vvzcj!" as the message and decrypt with either of the keys obtained (yveyje and sveyje). I think this is a very strong indication to focus on decrypting the rest with autokeyed vigenere.
I have no idea how to use 8404. I tried something similar with the other two ciphers (Sowehws Hipn - Aghfil Nxblq) and didn't get anything meaningful. I tried both keys as tiny pics and tiny urls, nothing. I'm not sure what "No Post No Bills" means, but it looks like some imperative for Maddy, or maybe the dropped-off armless person.
I tried my best to explain how I got this, and hope some of you understand it well enough to take it further. Right now I'm beat and need to eat. I'll get on chat after that and see what everyone thinks of it.